Folding cells in jupyter lab - jupyter-lab

I'm working with JupyterLab 3.0.14 and I swear a few weeks ago I was able to collapse all cells between two markdown cells with H1 titles in it.
I don't mean clicking the blue rectangle at the left side of the cell. There was a white triangle that let me collapse all cells between that H1 and the next one like the red one drawn in the screenshot.
I'm working with a large notebook and that feature would be fantastic.
Is it possible that I override that feature?
No updates of JupyterLab (as far as I know). My notebook preferences are just:
{
"codeCellConfig": {
"lineNumbers": true,
}
}
Thx in advance! Rgds!
View screenshot

This question was answered by #krassowski via comments:
This feature is available in JupyterLab 3.1, not 3.0. I refer to it as "collapsible headings". There is no need to change any configuration for it to work.
It would look like you got a downgrade, for some reason.
Thank you!
$ conda update --all
solved it ;)

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Vim and terminator programming environment

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White bars at the top and bottom of extension when opened in chrome

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Here's a picture for reference:
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The white space at the right side isn't part of the problem it was just the way I captured the picture.
--Question was answered by wOxxOm in comments below.

Change Text Highlight Color in Eclipse Console

Question
Is it at all possible to change the color of the text highlight in Eclipse console to something more visible in Manjaro Linux? Your time and help are both much appreciated.
Important notes
I am using the default GTK theme. I do not want to use a different theme.
For testing, I have tried using a different theme, but that didn't help.
Problem
Currently, I am stuck with a barely visible light grey text selection in Eclipse console in the following two scenarios:
When manually selecting text
When using the Find\Replace... search function
Supporting screenshots
Manual mouse text selection:
Find/Replace... selection:
Looking into and changing these settings did not help:
I once ran into the same problem and used the gnome-color-chooser to resolve this issue.
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0\ntooltip_bg_color:#f5f5c5\nlink_color:#DD4814"
Also refer these post which helps you in future for similar kinds of problems.
Change Eclipse sidebar vertical scope highlighting
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Android - Set Default Spinner Themes

I'm new to Android development.
I'm using drag and drop to pull down a default spinner onto my layout.
However, the default is not the one I see everyone using with the triangle on the bottom right.
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http://www.mkyong.com/wp-content/uploads/2011/11/android-spinner-demo1.png
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http://i.stack.imgur.com/X82Ld.png
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Thanks so much!
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