I'd already tried quiting and re-starting without it fixing the problem, but when I quit and restarted for a second time, the tool matrix reverted toa sensible size ... odd.
Newbie using draftsight 2019 on Linux, at first I wondered what the tool matrix did, then realised you had to drag other toolbars into it, it started out at a reasonable width allowing about 8 icons per row, and the toolbars wrapped into the panel nicely, but then I dragged the tool matrix to...