Danielle,
It seems like you had just turned your guide lines off.
When they are off all their settings in the work environment are greyed out.
Turn it back on via the menu of toolbar button if you have one set up.
Or go into the work Environment and turn them on there.
It isn't very clear that the icon in the top left is actually a button untill you drag your mouse over it.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11