The currently selected brush is used for drawing the ellipse outline. Click and hold the left mouse button to indicate one corner of the ‘bounding rectangle’ of the ellipse, then move your mouse to the opposite corner. Krita will show a preview of the ellipse using a thin line. Release the button to draw the ellipse.
Is Krita good for logo design?
Krita is more of a raster based program geared towards illustration and digital painting. It would definitely have some uses in the web design category, but overall it’s not what you want, especially for logos.