Thank you for the clarification!

It is already possible to configure this via Arduino IDE's advanced settings:

Press the Ctrl+Shift+P keyboard shortcut (Command+Shift+P for macOS users) to open the "Command Palette".
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.
Type editor.tabSize in the "Search Settings" field of the "Preferences" tab.
Set your preferred tab side in the field under the "Editor: Tab Size" setting.
Close the Preferences tab by clicking its X icon.

Even though you only mentioned the whitespace resulting from pressing Tab, most who want to customize that will also want to customize the IDE's auto format configuration to match. You can learn how to customize the formatter configuration from this tutorial:

https://docs.arduino.cc/software/ide-v2/tutorials/ide-v2-customize-auto-formatter

You will be interested in the IndentWidth setting.

If you like the approach required of Arduino IDE 1.x users of configuring advanced settings by editing a configuration file directly, you can open C:\Users<username>\AppData\.arduinoIDE\settings.json (~/.arduinoIDE/settings.json for any Linux users who are reading this) and then change the value of the editor.tabSize key.

Regards, Per

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