Hello @sunny324,
I hope things are going well for you.
If the question is related to the Theme > Customizer, then I recommend that you review the browser console log by right-clicking on the same page and clicking on Inspect if you’re using Chrome. Then, click on the Console tab and refresh the page. If you see any errors in red related to the theme or plugins, then you can try deactivating them, and for further troubleshooting, try switching to another theme temporarily.
If you see no console errors in the browser, then you can try some workarounds as suggested here: https://docs.presscustomizr.com/article/232-customizer-appearance-customize-is-not-working to narrow down which specific element is causing the issue. This way, you will find the root cause and be able to resolve it.
Also, if neither of the above works, try a full conflict test. This guide will help you: https://wpmudev.com/docs/getting-started/getting-support/#conflict-test. But first, for safety, create a full site backup.
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Kind Regards,
Imran Khan
