Mainly due to stiff arthritic typo-fingers, plus age, I much depend on the marking (red squiggly line) of spelling errors, however, I have found that in large ODT documents then such are not being marked until I right click, if then, versus simply continuing to type. See image.
https://i.postimg.cc/0QLMRB5C/LO-spelling.jpg
PC specs: 128GB RAM; Ryzen 3200GB CPU; NVME and SSD drives; Windows 11 Pro (I thank God for all).
Please do not suggest the default solution of “Reset your user profile” which is not going to be considered a solution. This issue is not new, and since spelling errors are marked if I right click in a large document then the dictionary is set. Paragraph styles are the same.