I think a lot of changes are inevitable. He's figuring out which players are stylistically the best fit for his formation
and how good they in general. Wouldn't surprise me if more or less every senior player has a start by the time of the Everton game.
That said, where he sees someone doing well, he might consider that spot settled and simply keep the person in place. He seemed to be pleased with Amad for instance, so maybe he'll continue for a couple of games.
My guess for this game would be
Onana
Yoro-De Ligt-Shaw
Amad-Ugarte-Mainoo-Malacia
Zikzee-Mount
Hoijland
But if someone gets the lineup prediction right, they should just close the competition, the line up could hardly be any harder to predict.