I feel that due to the large number of tabs, when I click on the 'save and reload' button, instead of staying on the settings page, it redirects to the themes page.
In the first method I reduced the number of tabs by moving the options inside them to other tabs to confirm that the issue is indeed caused by having too many tabs, but it didn't resolve the problem.
In the second method, I removed the 'widgets' 'verification' 'user-menu' and 'tour' tabs, and upon clicking the 'save and reload' button, I observed that the settings were saved, and I remained on the settings page.
I changed the "max_input_vars" value from 1000 to 3000 in my hosting, and everything worked fine.
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