Demo Mode Settings lets you fine-tune the icons in the device status bar.

Note that this requires granting this app the DUMP and WRITE_SECURE_SETTINGS permission. This can be done with adb (you can use this script https://drive.google.com/file/d/14Vgx2VUX32zfhbtQ8hYghn27pukjrsMn/view?usp=share_link) or with root access.

For free you can hide notification icons and change the battery level. With a small in-app purchase you can unlock all the modifiers available in Demo Mode Settings.

Note that not all devices support all icon behaviors.
To learn more about Demo Mode in Android see https://android.googlesource.com/platform/frameworks/base/+/1291b83a2fb8ae8a095d50730f75013151f6ce3f/packages/SystemUI/docs/demo_mode.md