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I tried to use bridge edge loops to connect two faces into the arch, but it behave quite weirdly. Could you suggest how can I fix it?
Just increase the Number of Cuts parameter in the operator settings panel (F6), and adjust the Smoothness value to a desired outcome.
It looks like if you use the W > Bridge Edge Loops, you need to tilt your faces a bit. If you use the W > LoopTools > Bridge (LoopTools addon), you don't need though.