This does vary from site to site but if your site has side menu options, you may want to have some variance depending on the page the end user is on. See the below image:
To change this, simply login as usual and up in your workbench select "Menus". From there you can simply select or deselect which menus you would like visable on the side. Click the refresh button and it will update for you!
A simple little step but very helpful none the less.