I have installed Cache Cleaner Pro and is not visible.
I have checked the Extensions in Extension Manage and all are enabled.
I have also checked the Plugin and that is enabled.
The extension is the latest and using Joomla 4.2.6
You should see the Clean Cache button in the top-right.
If it isn't there, it could be due to a customized admin template.
Also check that the Cache Cleaner Administrator module is enabled.