I found that in order to control the turn, you’ve got to ease the forward pressure on the blade and rotate the saw so that it digs in with the teeth on The side you are turning to. This starts the cut drifting along the curve you are after.
this is easier to do with the finer depth blades, some I have seen with big box store saws are 6mm or so. I use some eclipses blades that are around 3mm (front to back) and these hold their edge better and (I have found)are far easier to control.

above all take it slow, brush or blow away the sawdust to keep your line in sight and keep the blade square to the work and straight up and down in the cut.