The Spaces property in the GlobalConfig contains optional setting related to characters to be considered spaces, i.e. to be ignored by spell checking. .
Remember to recycle the application pool after reloading the modified GlobalConfig.
<SpellConfig
...
Spaces="--"
...
The space character itself and the end of line are always automatically considered spaces, if other characters need to be ignored add it to this list.
Characters that are not in the Spaces nor in the Alpha lists are considered punctuation, and checked as such.
IMPORTANT: To make these changes available to the GN4 users, after you saved the GLOBALCONFIG.XML file and imported it into the database, or after you modified it in EdAdmin4 and saved, recycle the GN4 application pools on all IIS servers and then make all users log out and log back in.