I found a keyboard help file [device settings>controls>language & input>samsung keyboard{the gear to the right}>help{near the bottom}>using the keyboard. This shows using the return symbol [the one on the right of the button on the edge of the device] to 'disappear' the keyboard. When you want it back, you just tap the apps popup window, the one that the letters appear in. This works with my pageflip cicada and p900 with blue tooth on, both devices.
Dell Latitude 13.5" 2-in-1 Ubuntu/Win 11
Samsung Note Pro SM-P900 12.2 Android 5.0.2
Samsung S7+, Android 12
Samsung Note Pro SM-P900 12.2 Android 5.0.2
Samsung S7+, Android 12