Theme Options like General styling, advanced styling etc not showing after WP5.5

I am only able to see the heading Theme Options and none of the others like General styling, advanced styling etc after installing WordPress 5.5 while I have already checked after:
1. deactivate all the plugins
2. removal of caches
3. increase memory wp-config.php

Please advise us, how to get Theme Options.
Dr. Shiv Kumar



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