cant' Drag and Drop for Design Systems - android-studio

After update the android studio I am enable to use material designing. but I can't user any UI element in drag and drop mode. mouse curse shows in halfly cutted black circle

the new version of android studio uses 2 xml files for each layout. One (e.g. content_main.xml) embedded in the other one (Activity_main.xml). you should open the content_*.xml and do the design in it. hope it helps.

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Android Studio Chipmunk - XML Layout Designer Split View Change Orientation

I'm not sure what happened, but the Split XML design view is now showing horizontally instead of vertically. (Design View is on bottom and Code view is on top.) I can't find anywhere on the UI to change the orientation of the design and code panes.
After playing around with the interface for longer than I'd like to admit...
Clicking on the Split button again flips the UI between horizontal and vertical split screen.
I'm not sure if this is a new feature in Android Chipmunk or if it's always been this way, but I could not find a duplicate question or answer on Stack Overflow or the web.
I faced a similar situation in version. Android Studio Chipmunk | 2021.2.1 Patch 2
I noticed that by pressing the Split button it became old value.

Android Studio - view both Text and Design preview of layout

In Android Studio, how can I view both the text and design preview of an XML layout side by side.
I could see it by default when I installed Studio, but now that is gone,
and I'm not sure why. I can only see or the other.
How do I re-enable it?
Open your [whatever].xml. At the bottom you'll see Design and Text. Select Text. If you still can't see the actual layout, only xml, then select "Preview" which is located at the right of the window, between Gradle and Maven Projects.
Click on preview while text is selected.
At first, select your desired .xml layout from the Project tab then use Code, Split and Design buttons to switch between the views. (Android Studio 3.6)
Code - Display only XML part
Split- Display XML and design both
Design- Only design part
It appears that in Android 3.6.1, the buttons to select Design, Split, or Code have been placed in the upper right of the XML layout screen.
Select any one from the top right options to change the view of your Code and Design
You can split the tab by right-clicking on the tab and selecting either Split Horizontally or Split Vertically. Then, you can select the Design tab on one and the Text tab on the other.

Android Studio - Can't move or drag buttons freely

I'm new to Android Studio (working on Windows) and I am now using Buttons for the first time. I'm using them inside a TabHost. It seems that I can't move/drag the buttons to anywhere I want in the design, they just stay at the top of the design. I've searched this on Google and someone suggested a RelativeLayout instead of a LinearLayout. I've switched layouts already and I still can't move the Buttons as I want.
Any ideas? Thanks in advance

Switching TabHost Tabs in Android Studio UI Designer

How can I switch between the tabs of a TabHost in the UI Designer for inserting content? Is there a keyboard shortcut or something else
I found a way to visualise any tab using TabHost in the UI Designer. Is probably not the best way, but it works.
1. Go to the Component Tree, where you have all the elements of the UI.
2. Inside the FrameLayout that TabHost automatically creates for you, there are the tabs.
3. If you change the order of the tabs just drag and dropping in the Component Tree, you get to see the one that is placed in the first position.
UPDATE:
According to this answer there is no way to change the tabs of a TabHost. That question refers to IntelliJ; I don't know if it applies to Android Studio.
Also, it seems that TabHost has been replaced by FragmentActivity and ActionBar. See Android how can i replace the deprecated tabhost? for a discussion.
It is defined as "Select next Tab in multi-editor file" in Settings -> Keymap.
On Windows it seems to default to CRTL+SHIFT+RIGHT/LEFT or ALT+SHIFT+RIGHT/LEFT. On my Mac it defaults to CTRL+SHIFT+RIGHT/LEFT.
Note that Studio doesn't allow the default Keymap to be edited so you will first need to copy the default and give it a new name.
Also see Shortcut to switch between design and text in android studio.
By mouse, select the FrameLayout then long left click on any space in it.

What is this "pull down" icon in Visual Studio 2012 text editor used for?

The icon below shows at the top of the vertical scrollbar in Visual Studio 2012's text editor. When I drag it down, another page shows behind the current visible page. It looks like a copy of it. (I am using dark theme)
What is it used for? I don't know what the feature is called, therefore I couldn't search for it. I am not sure if it's native to VS 2012 or it's from one of the VS add-ons I am using.
Sometimes the icon disappears. Why?
It's for split viewing of a file. So you can view part of the file and edit another part.
It's a common feature in advanced text editors.

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