The Spacing and Capitalization submenu offers:
The No Spacing command which enables to inhibit spacing after the expansion.
The No Capitalization command which enables to inhibit capitalization after the expansion.
Note that you can also:
Inhibit spacing after an expansion by adding a trailing underscore ("_") at the end of the Long form of your glossary entry.
Inhibit capitalization after an expansion by adding a trailing vertical bar ("|") at the end of the Long form of your glossary entry.