The AD5752 consists of two DACs internally.
Can I use one DAC to generate unipolar voltage and another DAC for bipolar voltage simultaneously?
It is a dual channel DAC.
The voltage range applies to both channels. If you supply it with +-10V, then both channels can output voltages in the range of +-10V.
There's nothing that says you have to put out negative voltages, though.
You can send values to one DAC that always generate positive voltages. That's your "unipolar" output.
You can send values to one DAC that generate positive and negative voltages - that's your "bipolar" output.
Or, you can send "bipolar" signals to both DACs.
If you only need positive output, then you can supply it from a single supply, and not be able to generate negative voltages at all.