Power Apps Portal: Finding current version or clear portal cache

Straight to the point:

Going to your portal service page: https://your_portal.powerappsportals.com/_services/about

Note: You must be the admin for the environment or valid role to access the above URL

You can see the portal version like below

In Some cases if you are missing navigation or page which is not rendering the content then you may need to clear the cache. In the same URL at the bottom press the Clear Cache button.