IDE 2.0 borderline between program and black screen

The borderline between the editor part and the black screen part of the IDE is somehow too thin.
When I try to get a grip of it with a toucscreen, it slips and then my cursor paints the source text

Do you mean the "Scroll Bar" width?

If so, go to the advanced settings, explained by @ptillisch in you "speech bubble post", select "Preferences: Open Settings (UI) then type "Scrollbar.Vertical Scrollbar Size" and select a number to suit your required width.

No, I do not mean the vertical scroll bar.
I mean the horisontal line, which you grap, when you want to change the size of the black screen, where the error messages are written.

Understand. I do not know whether that is under the control of the IDE or the operating system. Sorry I cannot be of more help.

You can adjust this in the Arduino IDE advanced settings. I'll provide instructions:

  1. Press the Ctrl+Shift+P keyboard shortcut (Command+Shift+P for macOS users) to open the "Command Palette".
    A menu will appear on the editor toolbar:
  2. Select the "Preferences: Open Settings (UI)" command from the menu.
    You can scroll down through the list of commands to find it or type the name in the field.
    A "Preferences" tab will open in the Arduino IDE main panel.
  3. Type workbench.sash.size in the "Search Settings" field of the "Preferences" tab.
  4. Increase the value in the field under the "Workbench › Sash: Size" setting according to your preference.
    Changes to the setting take effect immediately, so you can test various values in turn until you find the right one for you.
  5. Close the Preferences tab by clicking its X icon.

You might also be interested in the related workbench.sash.hoverDelay advanced setting.

FYI, the term used for this is "sash".

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