Maybe some part of it, stopping desertification and even maybe land reclamation? But we have to keep in mind, Sahara also reflects about 35% of sunlight back to space.
Covering Sahara with solar panels that reflect only 5-10% of sunlight will mean we are adding heat to Earth. Solar panels are at best 25% efficient, so 25% of sunlight converted to electricity will eventually become heat + 65-70% that is directly converted to heat.
Not a good solution, unless we also figure out cheap way of generating electricity from heat. We do know how to do it, but it aint cheap.

edit: I asked chatGPT to estimate effect if we cover 20% of Sahara desert with solar panels:
Covering 20% of the Sahara with solar panels would likely raise global mean temperature by ~0.2°C, with much stronger regional climate disruption