Yes... there is spell check within this new format (but it works a little funny).
If you misspell a word, once you space away from the misspelled word... a wavy red line will appear under the misspelled word (see red arrow below).
View attachment 263543
You would then "right-click" on the misspelled word and select the correctly spelled word from the drop down menu... or just retype the misspelled word correctly.
View attachment 263541
BUT... if you misspell a word and keep typing without making a correction to the misspelled word,
the wavy red line under the misspelled word may disappear... and you may not know you have misspelled word(s).
See example below - red arrow (misspelled "wordd"... but no wavy red line).
View attachment 263542
So it is best to correct misspelled words as soon as you notice the wavy red line under the word.
There isn't an actual spell check feature on the platform. That appears to be your browser spell-check.