Wiganken means the MyCMD "group" not "tab."
The spacing of things like the [Quick] Styles Gallery is automatic and not adjustable by the user.
An option is to create a separate tab with just the Styles group on it.
A button for that gallery can also be added to the QAT.
See also my free
Styles QAT Add-In which gives you a button on the QAT to access the Quick Styles from any tab.