SQLiteStudio stores it's whole configuration in a single file, which is SQLite3 database. Below are locations of that file, depending on operating system.

There's also possibility of using portable configuration directory (that can be moved together with application files onto USB drive, etc). This case is described at the very end of this page.

%APPDATA%\SalSoft\sqlitestudio\settings3

For example:

C:\Users\my_user\AppData\Roaming\SalSoft\sqlitestudio\settings3

$HOME/.config/sqlitestudio

For example:

/home/my_user/.config/sqlitestudio

$HOME/Library/Preferences/SalSoft/SQLiteStudio/settings3

For example:

/Users/my_user/Library/Preferences/SalSoft/SQLiteStudio/settings3

If - during start of SQLiteStudio - there is a directory called sqlitestudio-cfg in the same directory where SQLiteStudio executable is located, then SQLiteStudio will use sqlitestudio-cfg for storing configuration. It will create file at location:

sqlitestudio-cfg/settings3