I agree. This option is not available. However, as you are using most of the settings on all of your themes, especially the Elementor based themes, it would be nice to have an export/import capability. Add it to your ‘future development list’. 🙂
Right now, I have to save each individual block and field to a text editor, change the theme, then copy/paste into the new theme settings. Regretfully, if you go back to a previous Grace Theme, it shows the default settings. Truly, any customization should be saved with the theme, even if it is inactive and if activated, should use the prior customizations.
In fact, if you can ‘standardize’ on your fields, then add an option to retrieve customizations from other themes, that would truly be awesome.
You’re doing great work but a few additional functions will truly make it world-class.