Cann't change matplot backend

[Eugene E.]

Hello!

Can anyone help me to restore matplotlib backend switch functionality? Once I switched to qt5 using

%matplotlib qt5

and now I can not go back!

I open empy notebook, and type:

%matplotlib inline

then just

%matplotlib

to get current backend and it is still qt5! I tried switching to 'notebook' backend and it does work, but not the usual 'inline'. How to get it back?