Ability to switch between Design Modes (template or create my own) after onboarding completed

What problem does this address?

Hi team

Further to this issue: - and this issue - while on-boarding you have to choose a design selection - either "Use a template" or "I'll create my own" - which is wonderful to have that choice (as most of the time I prefer to use a child theme page) - but there does not appear to be a way to change that once selected - and it would be good to be able to change one's mind without having to reinstall the plugin.

What is your proposed solution?

In the General or the Design tab - could you provide a facility to switch between the design modes - perhaps a dropdown;

1. Use a template or
2. "I'll create my own"

If I choose either of the above during set up - there is no way to go back except to modify the database option (wpmm_new_look) - which surely could just be done with a switch in the plugin.

Maybe add some code to enable the modification from wpmm_new_look= 0 to wpmm_new_look = 1 ?

Will this feature require documentation? (Optional)

I dont know.

The issue names the General or Design tab and the wpmm_new_look option; start by tracing how onboarding stores and reads that option. Add a persistent way to switch between “Use a template” and “I’ll create my own,” then verify that changing the choice updates the selected design mode without reinstalling the plugin.