Support
How to make the CRS selection button reappear for a project?
For the CRS (Coordinate Reference System) selection button to reappear or become operational, you must check the following configuration in the application:
Disable the Default Coordinate System
The most likely cause for being unable to change the CRS is that the "Default Coordinate System" option is enabled in the general settings.
When this option is configured, the coordinate system is fixed in such a way that it cannot be changed, not even when creating a new project.
Solution: Go to Menu > Application > Settings and ensure that no option is selected under "Default Coordinate System" that blocks editing.