I have a concrete patio with a 4-foot by 2-foot shallow oval area that retains water. The concrete is sort of a knockdown pattern (see photo). How do I resolve this depression without smoothing it over and making it slippery? How do I level the area and make the pattern match the surrounding area?
Is this a drain strip?
If so it may be possible to cut some shallow grooves in the patio concrete decking to conduct the standing water in the depression over to the drain strip.
It would obviously be your choice but this may look better overall than a smoothed on patch or filler. Such grooves could be cut by someone experienced with using a portable power grinder with a thin cutoff type blade.