There were races where DeSantis didn't endorse anybody. For example DeSantis didn't endorse anybody in the GA Senate race.
DeSantis chose to endorse Bush establishment O'Dea while he didn't endorse Walker in GA.
BTW, Trump mock-endorsed Abrams.
DeSantis suits up for Herschel Walker ahead of Georgia’s Senate runoff
"The Florida Governor gave the Georgia Bulldog football legend a treat, gifting Walker a last minute endorsement as he looks to stiff-arm Democratic Sen. Raphael Warnock in the final showdown of the 2022 midterm elections."