missing sheet tabs

[Rawxl1]

Sometimes when using Excel the sheet tabs and the movement buttons on
the bottom left hand corner of xl disappear but I can still click on
them. After rebooting they appear but only to disappear again. Why do
they vanish ?

 

[famdamly]

Click on tools---options----view

Then you can set your options there.
Check out all the options.
It's nice to be familiar with them.