I received your email. Thanks for your screenshots Apparently, you are using the U.S. Spelling plug-in. The toolbar button is in the plug-ins bar. This should be uninstalled. To uninstall the plug-in, you can go to Tools menu, Plug-ins sub menu, and then select the Spelling (U.S.), and click Uninstall button.
The context menu should be populated with suggested words when you right cilck on a word underlined with a red wiggly line. “Add Dictionary” will be right after all the suggested words. When you define menus, “Add Dictionary” can’t be selected, but it is included in “Spelling Suggestions” command.
I hope you understand all the above. Please let me know if you still have questions.
Thank you for using EmEditor!