The layer table columns jump to the left when a layer is clicked for editing. I’ve never seen this reported and thought it was something happening here, but it also happens on my new laptop, before I’ve customised the UI.
A shows how I arrange the layer table, docked left, which suits my workflow.
B Shows how the table shifted left when a layername is clicked for editing.
C is a work-around I use in V5 for the same problem - if the linetype column is visible, just by a touch, the table becomes stable.
Also, the sort arrow in the layer name header is a bit lost with its linework the same color as the background, it appears as a slash which is confusing as to which way the table is currently ordered.