Right panel not expanding, LR 6.3.1, no option for horizontal adjustment like left side.

All, the right panel on lightroom desktop not classic is too narrow for the panel and I am unable to adjust the width.  On the left side at the bottom when I hover my cursor over the bottom vertical panel edge line I get an prompt to adjust the width.  This prompt does not appear on the right side.  Any ideas on how I can reset light room or get the prompt to appear?