You can display all available accents of a letter on the Huawei smartphone by tapping and holding the letter. If you want to display all available accents, you can set this in the keyboard settings.

Android 10 (EMUI 10.0)
Step 1:  Open the  settings
Step 2:  Tap on  System & updates
Step 3:  Tap on  Language & input
Step 4:  Tap on  SwiftKey Keyboard
Step 5:  Tap on  Typing
Step 6:  Tap on  Keys
Step 7:  Activate or deactivate  Accented characters
  1. Open the settings
  2. Tap on System & updates
  3. Tap on Language & input
  4. Tap on SwiftKey Keyboard
  5. Tap on Typing
  6. Tap on Keys
  7. Activate or deactivate Accented characters

Huawei Instructions