How are these lines in IDE's called? - intellij-idea

Do they(pointed as red arrow) even have a name?

Vertical indent guides, can be disabled here:

Related

colored markers disappeared from intellij scrollbar

in Intellij Idea on mac, I wanted to remove the extra lint warning yellow marker lines from the scrollbar (still wanted to keep the red & green markers), but upon applying, ALL lines disappeared, so I reenabled all warnings (in editor->inspections) but still nothing on the scrollbar.
How do I get those warnings back?
PS: I should mention the scrollbar is now transparent such that it overlays the code window. It wasn't before so I think resetting that might fix the problem
You can restore to defaults by clicking the cog icon like down below.
It's important to check the Stripe Mark Settings in the Color Scheme. Stripe Marks are responsible for the little colored boxes in the vertical scrollbar of the Editor.

How to change left border width in Zen Mode PhpStorm?

I started using the PhpStorm IDE.
I found the perfect mode for coding called Zen Mode.
But I have one point to make about this. Its left border is so wide. How can I change this?
In Zen / Distraction Free mode the code is kind of centred (hence that big gap on the left: it gets bigger on a wider screen). It is by design. You may want to use Full Screen mode instead. https://www.jetbrains.com/help/phpstorm/2021.1/ide-viewing-modes.html
You may also want to check these links for some tips on how to customize your IDE:
https://blog.jetbrains.com/idea/2020/04/ui-secrets-customize-the-appearance-of-intellij-idea/
https://blog.jetbrains.com/idea/2021/02/find-your-visual-zen/
https://www.jetbrains.com/help/phpstorm/2021.1/tool-windows.html
Regarding the editor gutter width in general: see IDEA-148002 and check the comments and linked tickets there.

PhpStorm. Darcula theme. Disable left gap

How to disable the gap I've pointed to?
Or, at least, change its' color to the same as the editor area.
Distraction free mode works not as I want to.
Gutter background color can be changed here:

How to increase the gutter width in Intellij?

I am using Intellij Idea 14.1.3 on Mac OS X Yosemite 10.10.3. Often, while debugging, I want to introduce a break point by clicking on the left margin (called the 'gutter' in Intellij). The problem is that on many lines, there is no space to click. No matter how I try, the click happens on an icon already present ... which is not what I want to do. Attached a screenshot to show this
How can I increase the gutter width so that there is some empty space even where the little green override symbols are present?
It doesn't seem there is a way to configure the gutter size, it just resizes dynamically. I'd suggest raising an issue in the issue tracker.
As a workaround you can set a breakpoint on any line via the editor window. Set the caret on the line to stop at, and press ⌘+F8 (on a Mac).
This appears to be fixed in some future release of IntelliJ:
https://youtrack.jetbrains.com/issue/IDEA-137353#tab=History

Is there any way of changing colors of text in Xcode?

What I want to know is if you can change the default color value for something like comments:
//Yo
Which are by default, green. I want to know if you could make this red black or any other colors.
Also as a bonus, is there anything that works kind of like a little sticky note, but in the code? Some sort of image or something that would be easily recognized if you were scrolling through lots of code very fast. Like a place mark, an eye catcher. That doesn't affect the code.
Go to Xcode preferences, Fonts & Colors.
XCode menu->Preferences->Fonts and Colors, then have fun...
To put markers in your code you can use
#pragma mark - Something
It will then show in the drop down menu showing all your functions/declarations.
Edit: for newer Xcode versions, just use:
// MARK: - comment