* Find accessibility issues
* In the upper-right corner of Power Apps Studio, select the icon for the App checker.
* App checker icon.
* In the menu that appears, select Accessibility.
* A list of issues appears, sorted first by severity and then by screen.
* Select the arrow next to an item to show details about it.
* Accessibility checker details.
* Select the back arrow to return to the list of items.
* If you decide to address an issue, select it to open the affected property.
* After you change one or more properties, select Re-check to update the list of issues.
Resolved items disappear from the list, and new items may appear.
Reference:
https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/accessibility-checker
https://support.microsoft.com/en-us/accessibility/enterprise-answer-desk