I had this too, I think it’s a change within Kodi that changed this functionality.
I have resolved this by adding a remap, I don’t know if both of these lines are needed but it works for me.
Create a new file here ~/.kodi/userdata/keymaps/remote.xml
Give it these contents.
<keymap>
<global>
<remote>
<guide>ContextMenu</guide>
<title>ContextMenu</title>
</remote>
</global>
</keymap>
Then reboot