For example, the civil service passed new rules in the dying days of the Biden administration intended to stop Trump implementing Schedule F. This didn't come from Congress or the courts. They just passed it themselves. Trump is the boss so can undo that rule with a new rule, but they passed it within a framework of yet more rules they made themselves to slow that down so - if followed - it will take months. This is purely self serving protectionism and has nothing to do with democracy or the Constitution.
There's an interesting document here [1] that goes into all the ways the civil service betrayed Trump in the first term. Betrayal is a correct and moderate term to use. They were doing things like forging documents, lying to appointees about non-existent laws, refusing to prosecute legally clear cut cases in order to propagate woke ideology (e.g. discrimination against Asian Americans), deliberately keeping their bosses in the dark, refusing direct orders to do work if it would run contra to woke ideology and many more things.
From the Trump team's perspective the rules are largely fake: when they align with what the left want they're followed to the letter, when they don't they're ignored or subverted without consequence. He played that game in his first term, and is apparently no longer willing to do so. It's hard to know what Congress will do but presumably they're aware of the fact that their own laws have created this situation to some extent (even if not the full extent). It wouldn't be surprising to see civil service reform bills appear soon.
[1] https://americafirstpolicy.com/assets/uploads/files/Tales_fr...