You can also add Genre to a Custom Tag Menu in the left tag pane, and put that menu right at the top of the tag pane.
Click on the small menu button (tooltip "Tools") at the top left of the tag pane > Customize > Add... > Add Group > etc.
Also, if you have a Standard View with File List showing at the bottom, RMB on a column header and select Genre out of the long drop down list of fields to add a new column Genre. If Genre is already selected, it may be out of sight off screen. Horizontal scroll the window to find and display it. Left mouse button drag the column header to move it.
