Hey, I have a Heliboard question and not sure if this is the right place to ask, sorry.
I have three system languages in my phone. The three of them shows in Heliboard. I added three dictionaries, one for each. If I start typing using a secondary keyboard all words shows underlined in red. I see some words in the recommended area that seems to be correct but no matter the word selected it always shows underlined in red. This only happens for the second and third keyboard.
Spell checker is not checking all languages in multilingual typing: Make sure you actually enabled HeliBoard spell checker. Usually it can be found in System Settings -> System -> Languages -> Advanced -> Spell Checker, but this may depend on Android version.
Glad that it worked out in the end. It's a pity that different Android versions and custom ROMs have this setting in different places, I guess this is also making it impossible for the developer to put a direct link to this setting in Heliboard that would work for all users.