Hi Eugene,
Please check this page:
https://www.megamenu.com/documentation/adjust-sub-menu-width/
Percentage width menus will always be aligned to the left hand edge of the menu bar. In most cases, the only percentage width you should use is 100%.
I think you would want to set the Panel Width (Outer) to a pixel width (e.g. 500px) then set the sub menu align (in the settings for the parent item) to “Right edge of parent”.
So if i keep 100% then that looks too spread out.i tried to set the Panel Width (Outer) to a pixel width (e.g. 500px) then set the sub menu align (in the settings for the parent item) to “Right edge of parent”. but not getting desired output
Please could you post a screenshot showing the output you are looking for? Generally it is only possible to have sub menus full (100%) width, or a fixed width (e.g. 500px) and aligned to the left or right edge of the parent item.