To clear your cache in Microsoft Edge (2020 release and later):

1. Navigate to the three dots in the upper right of the screen.
2. Choose History.
3. In the top of the History pane, click the three dots.
4. Choose Clear Browsing Data.
5. If you are having trouble with library databases we recommend the Time range of All Time.
6. Check the options for Browsing history, Cookies and site data, and Cached images and files. 
7. Click Clear now.
8. Close and reopen Edge.

Set Edge to automatically clear some cache items when it closes

1. Click the Menu (three dots) in the upper right.
2. Choose Settings
3. Scroll down to find Advanced and expand that selection.
4. Under Privacy,search, and services.
5. Scroll down to Clear Browsing Data.
6. Select Choose what to clear every time you close the browser.
7. You may choose to delete all or select only Browsing history, Cookies and other site data, and Cached images and files.