If you are using a smaller sized screen (below 13") then you may see something like the image below.
What you'll notice is that Social, Help, Web and App settings have become overlapped and it will mean that you aren't able to select some of the options.
To solve this you will need to adjust your screens resolution. NB, you should be using Google Chrome when using your CRM.
Zoom out on your current page
Use the zoom options to make everything on a web page larger or smaller.
On your computer, open Chrome.
At the top-right, click More. (icon below)
Next to 'Zoom', choose the zoom options that you want:
Make everything smaller: Click Zoom out Zoom out.
You should be able to solve this issue by using 90% resolution.