when I click the "switch to arc" mode it doesn't do anything.

It is like the option is unable.

look the image

If you grab the tiny circle handle on the right side of the circle, and drag a little way, you'll see either the Arc or Segment button become engaged (depending whether your mouse was inside or outside the circle when you dragged the handle). If it's not the one you want, you will now be able to click it.

Notice as you drag that handle, where your mouse is positioned, while you drag. Notice if your mouse is inside the original circle while you drag, you are creating arcs. If your mouse strays outside the original circle, while you drag, you are creating segments (I call it "wedges" because segments seems confusing). I usually just drag the handle, and afterwards, click the button I want (and/or adjust the spinbox values), to get the final result (because I don't have the best mouse control).

Hi

After "switching to arc" you have to adjust the start and end angles.
The default of 0 and 360 still gives you a complete circle.

Ragnar, those values change automatically as you drag. At least that's how it works for me (0.91 Windows). Or you can also set them yourself.

I don't know if changing the values only, without dragging, would work. Testing.....

Oh yes! If you don't drag to start the process, you can just change the values (I guess those are degrees?) with the circle selected (or ellipse) and not have to drag at all

Edit
For me, both values are 0 to start.

Hi.

brynn wrote:Edit
For me, both values are 0 to start.

For me too! Just too used to referring to a circle going from 0 to 360 degrees (although I normally think in terms of zero to two * π - using radians instead of degrees.)

BTW, you can set the start position of the "0" degrees to be either at the "twelve-o'clock" position or the "three-o'clock" position in the preferences - - Behavior - Steps - Compass-like display of angles.