I cannot view the right hand side (RHS) pane of the Schema Browser. It is hidden.
I can see the context menu to Hide RHS, but the selection to Unhide RHS is unavailable.
There is no vertical splitter present to drag either.
Corrupt Toad.ini file.
If Schema Browser is fully maximized there may be no vertical scroll bar to right click an select Show RHS.
Restore window to display vertical scroll bar and to Right-Click and select Show RHS.
Or alternatively and simply, Right-Click in the tab's icon bar and select Show RHS.
You can also use the F12 key to toggle the right hand side to show or hide.