Clearing your Browser Cache in Microsoft Edge for iPads & iPhones
On your iPhone or iPad, open the Microsoft Edge application:
Select the three horizontal lines at the bottom-right corner of the screen:
Select the Settings icon:
In Settings, select Privacy and Security:
In Privacy and Security, select Clear browsing data:
Under the Clear browsing data popup, set the Time range to All Time:
Ensure the Cookies and other site data, and Cached images and files options are checked:
Then select the Clear now button:
When prompted for confirmation, select Clear now: