Thank you for your forum post.
A support call has been created for you, the call reference is F0071026.
Can you please send an e-mail to firstname.lastname@example.org
with a screen shot of what you are seeing when you select the setup tab and include the above call reference in the subject line of the e-mail.
Also does restarting SSMS resolve the problem?
Are you using any unusually large fonts or strange screen resolution sizes?
Confirm the exact version of SQL Source Control you are using?
Confirm the version of SSMS you are using?