I like the feature, this way I can (on my phone) type in letters that my keyboard doesn’t support (I use SwiftKey which is limited to 5 languages). However, I do think that there should be an option to at least turn if on/off generally (it would help to have a switch for each language/topic).
RE the keyboard symbol - it used to be “sticky”, meaning that, once you tapped the symbol, the (device’s) keyboard appeared for each and every typing test until you turned it off again. This was “rectified” some 2 or 3 years ago, sadly.
While @James_g_memrise promised several times that they would fix this, it never happened and I got tired of asking for it …
it’s fixed on the new version of Memrise for official courses which some Android users now have, for a while we were going to use the rebuilt learning sessions for all users, but unfortunately there were several delightful quirks with community courses which would have meant a lot more work, so community course lessons will stay as they are for longer