In GoLogin, you have a set of default profile settings that you can change for all the newly created profiles.
Note: it will not change the settings for your current profiles, to do that you need to utilize the bulk operations.
How to change the default settings:
Locate the down-pointing arrow next to the Add profile button at the top-right
Click on the Edit default profile settings
You can change various settings, including profile language, screen resolution, the profile OS, starting URL, bookmarks and other parameters.