Moving/ aligning/ extending lines

I sometimes have difficulty aligning lines when moving them in Layout. In this case aligning grid lines with dimension strings. Another issue is extending or shortening lines, it’s as if there are preset increments to line lengths, with no in-betweens. Just curious if these are the norms, or is there a setting?

Thanks for any help.

Maybe you need to turn off Grid Snapping in the Arrange menu?

Thanks Dave!