Hello,
We don’t have tablet settings. Only Desktop/Mobile for some settings(not for all) https://prnt.sc/1ec7mkj
I suppose that you think that the preview option switches between different builders https://prnt.sc/1ec7x6w But it’s only to preview how your site will look with the different devices, it does not save options separately for these devices. We have only 2 modes: desktop and mobile for the header builder https://prnt.sc/1ec87h7
Also, you may choose when the mobile point starts in Theme Options > General.
Regards