Windows titlebar icons - changing size/scale?

Customization
9

Well, I am a themer, so this is something I know a little bit about:
https://www.deviantart.com/aravisian

The icons within the button.image are set by the Icon Theme not by the Button size.
This is something we can change, too. Let's try setting the system theme up to be a certain size, then set the Icon theme up in similar fashion.

  .nautilus-window entry, .titlebar entry, window.ssd headerbar.titlebar, .titlebar,  .titlebar button *, headerbar button.titlebutton * {
     min-height: 42px;
     min-width: 42px;
}

The asterisks are a catch_all and they may not work as intended. For example, buttons you do not want enlarged may get enlarged.
So the above may need some tweaking.
The best way to do this is to create a file named gtk.css and place it in ~/.config/gtk-3.0/

Then reload the desktop with alt+F2 and enter into it r
in between making changes to the .css file to see the effect right away.

Icon theme:

nautilus

Create a directory in your ownership named .icons in your home folder.

sudo -i

nautilus

Navigate to the icon theme you want to use. If it is a Zorin theme: /usr/share/icons/zorin...
Right click and copy, then move it to ~/.icons
Right click the Moved Directory and set the User Permissions and Ownership to YOUR User account, not Root.
Click Apply to enclosed files
Once done, close out the elevated privilege Nautilus instance.

nautilus

Navigate to the moved icon directory and open index.theme
Search for scalable/actions and change the value for MinSize:

[scalable/actions]
Context=Actions
Size=16
MinSize=16
MaxSize=512
Type=Scalable

I set mine to 24. But you can set yours to 36 for example.
next:

[16x16/actions]
Context=Actions
Size=16
Type=Fixed

[24x24/actions]
Context=Actions
Size=24
Type=Fixed

[32x32/actions]
Context=Actions
Size=32
Type=Fixed

Same with this, for each, set the Size to the size you need them to be. Be sure to Save the File when done.
This MAY backfire on some apps, so please update with this thread to find a solution.

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