Check out the recommendations for the theme. Dark themes starting from EMUI 10 require
Dark Mode to be enabled and after applying it is worth restarting the device.
For those below version EMUI 9.1, the instruction can help:
If the theme is full (Large Theme), you must try to disable visual effects, for this:
- Go to Settings - Control - Accessibility - Disable "Additional visual effects".
- Restarting (Required!)
- Next, go to Settings - System - For Developers - Set Animation of windows, transitions and animation speed with a value of 1x.
Important: If you go to "Accessibility" again, you will have to repeat these operations again