What method do you use? I progammed the Fn button. Is it true that no icon indicates AE lock on Android?

Hi, there. Sorry for any inconvenience caused. Please try the steps below: On the live view page, tap on the screen, there is a yellow box appears, that indicates the camera is metering, press and hold the yellow box and the Auto Exposure locked promptly will appear. At this time, the lock icon appears in the center of the yellow box, indicating that the exposure is locked.