How do I switch to a straight line with PowerCurves?

I'm trying to draw a Power Window using PowerCurves in Davinci Resolve but the area I want to mask has straight lines AND curves. After I click and drag to make a curve, how do I make the next segment a straight line? (So that there is a sharp corner).

For example, the image below I've drawn a curve and now I'd like to create a straight line from it, but it immediately starts off as a curve. Thanks.

You only have to click and drag the top point, the other points you can just click. You can then adjust the bezier handles on the top point to have it fit the curve.

Center double-click on the point to turn a curve into a straight line. Use option-click-drag to move or extend just one side of a curve.

Somebody should do a tutorial just on the art of drawing good masks. I have to say, it's a lot easier in Fusion than it is in Resolve Color, and I wish the former would be incorporated into the latter.

Thanks guys. I'll give this a go.

This thing is driving me crazy too.
In EVERY mask you do with the powercurves tool, you need to mix curve and straight line.
So i need to know if there is a shortcut for remove only the NEXT handle, not the PREVIOUS.
Becasue if i have done a curve, and then i have to make a straight line, if i double click on the center of the point it will remove both the next and the previous handle, making this shortcut useless.

For example, photoshop do this very well: if you press alt+click it will remove the next handle, so you can have a curve followed by straight line easly. And if you just click on the center it will remove both the handle.
Somethimes, copying the other program that works better could be a great idea, Blackmagic.

Does anybody have a video tutorial on how the powercurve works?