A. Check if the playback speed adjustment feature is enabled in the app settings. Go to 'Settings' > 'Playback' and ensure that the speed adjustment option is turned on. If it is already on, try toggling it off and then back on again to reset the feature.

B. If the feature still doesn't work, try uninstalling and reinstalling the app. This can help reset any corrupted settings that may be affecting playback speed.