holding down both "ctrl + a " (together)
once will unlock into 15 degree increments,
twice will unlock it to be free
note: easy to do with "ONE HAND"
better yet, get a multi button mouse.
i've been using a
Logitech performance MX
with around 8 programmable buttons and such.
been working great for many, many, many years.
cost $100 at the time
one button is set for F12, another for "snap"
set the other ones for commands you use a lot.
some other neat ones on the market from what i've heard.
you'll really miss it if you have to use a simple no button mouse with softplan