How do I get the default settings back? I accidentally wrote a value of 2 in the field shown in the picture and I can't change it in any way.

I enter value 1 in this field, press enter, but nothing happens.
I tried to uninstall and reinstall the program - the settings keep the value 2

Try to change the setting ui_scale in the editor_setting.cfg. You will find the file at C:\Users\username\AppData\Roaming\RPG in a Box.

[general]

language="en"
default_tab="documentation"
default_file_tab="game_explorer"
default_model_filter="name"
theme="obsidian"
show_guide_popup=false
last_changelog_viewed="1.1.4"
ui_scale=1.0
version="1.1.4"