I lost my Line Gallery

[Wolfgang]

Somehow I lost my Line Gallery and can't seem to get it back.

I had doubleclicked it by error in the dock, which opened the Line Gallery as a seperate window.
Instead of dragging it back to the dock, I closed it.

Now the Line Gallery is totally gone.

If I go to Utilities > Galleries, the Line Gallery is checked, but nowhere to be seen. Also I can't uncheck it.

I already restarted the program and re-imported all my settings from XaReg. But it did not help.

Any ideas how to get it back?