Choosing effects tab makes my sequence disappear.

[Lynn5E0A]

I want to apply some effects to my sequence but it disappears when I open the effects tab.  What am I doing wrong? I have the sequence in the editing tab. 

[Ann Bens]

Start with resetting workspaces.

If that does not work: FAQ: How to reset (trash) preferences. 

[MyerPj]

It helps when you use the terminology Adobe uses. You appear to be selecting a different workspace and not just selecting a 'tab' of a window/effects control. 

Right-click the effects Workspace up on top where you select it and choose "Reset to Saved Layout",