Dear Xara...

You appear to have a strange failure in the Line Gallery.

Bug - The Line Width input box appears similar to the one in the Standard Toolbar. You, however, keep focus on the main drawing page so any number input (1, 2, 3, 4) will resize the page.
You can only pick from the limited drop-down list. This may be due to the non-modal nature of all the galleries but is wrong where data entry is expected.

The Line Gallery is the only gallery where input and other data selection (drop-downs) occur.

Acorn