Overlay Ui in Android Studio - android-studio

i am a beginner in android studio , i want overlay like this
can anyone suggest me , how can i achieve this .it will be very helpful for me , Thank You

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Why is my Android Studio not functioning properly?

I'm having a lot of trouble since I installed Android Studio to learn Android Programming.
I'm getting an error message like this and even my Pallete is not being displayed.
Please help me solve this error. Sorry if the way of asking this question is ridiculous cause I'm new here.
Download ALL SDK Tools and restart your android studio

Android studio : font doesn't have a color

I've recently installed Android studio, started to code, but my code doesn't get colorized, which is very very annoying.
Has someone an idea to solve that ?
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Can´t see UI Preview on Android Studio 3.1.3

i´m using Android Studio 3.1.3 Build #AI-173.4819257 and i have the problem, that i can´t see UI Elements on Preview while using the Designer mode.
Did you have any ideas how i can solve this?
Can´t see UI Elements on Preview
Is solved. I found an other question on stackoverflow, where is the same problem, and a User mentioned that´s a bug in Android Studio 3.1.3

Why android studio does not show the layout?

Why this still appear when I try the app on my phone it works very well but the preview not ?
help please.
https://i.stack.imgur.com/TN9rv.png

I Can't Edit my files in Android Studio

For some unknown reason, I can't edit files in Android Studio. This include both java and xml files and other files ,
I can't edit nothing - cut files , or delete , write , nothing worked..
Files are not locked as Read-Only. I checked.
Restarting Android Studio did not resolve my problem.
Please Help me ! Thanks
This Can happen when you loose the focus of your Code View. you can keep focus by having a click on Scroll bar (right side) in the Android Studio.
This problem was in Android Studio version 1.2.2, So haven't experienced recently.
please Update Android Studio.

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