Adjust selecting lines in Draw

This is fairly minor, but irritating.
If I have a number of objects which I wish to group, but with a straight line that is not to be included in the group, then doing ‘Select All’, and Adjust clicking on the line should do what’s required.

This process works as described on my Risc PC, but on the Iyonix (5.16) this is not possible without using 2:1 or higher zoom, and even then the point where the de-select works is not on the line, but somewhere below.

This is completely repeatable, and has been around since 5.13, and possibly earlier.

More details, and sample case if anyone feels like looking at it.