2 Points, Radius - why Radius is 1

I've installed LibreCAD yesterday, and went through wiki LibreCAD users manual. Today I've begun with trying to check how tools work starting from Circles and failed very soon.
Selecting "2 Points, Radius" I am asked for the first point, then for the second point and then I read:
"radius=1 is too small for points selected distance.....".
I was not asked to specify radius.
Is there any default radius value?
Where I define it?

At the top, above the drawing area, next to pen properties, there is a tab that changes according to the ongoing operation. Here you can set the radius. Always have a look at that tab when you are confused where to make a setting.

Thanks.
I've set there 30 and I have some circles done using this tool.
But it was not so easy :). I felt into the situation:
Specity second point and each time I click anywhere I read in Command line:
radius=30 is too small for points selected distance between points=1e+10 is larger.....

I found when it happens: When click for first point, then for second and then i press Esc.

I am doing my first real drawing and have next question, but I'll make new thread.