XYplorer Beta Club

Widened the size column but after going up and down in the breadcrumb path it reverts to it's previous width

I don't use Column/Detailed View that often, so i only presume, Save Column Layout may keep the changed width or Autosize should be used so everything is definitely visible.

Or it's a folder view setting.
Or it's a side effect of Configuration | Colors and Styles | Styles | Columns | Autofit the width of the Name column.
Or this one should be unticked: Configuration | Colors and Styles | Styles | Columns | Always autosize the Size column

Hard to say without additional info or a screenshot.

tested thoroughly ,I've tested it with -- Always autosize the size column enabled and disabled and sometimes after the size column is resized it remembers it width and sometimes it doesn't remember

many days have passed, fix?

Can't reproduce.