What was the meaning of the scene of Albedo at the end of Overlord season 2 episode 10
She's showing contempt over the Ainz Ooal Gown banner, and worshipping Momonga's personal banner. She was made to love Momonga through her settings, so she's not really happy with him dismissing that name. She wants him to be Momonga, not Ainz. Another factor of her discontent is the fact that the rest of the NPCs of Nazarick would obey their creators orders before Ainz' (she questions them about this), so aside from Pandora's Actor, she's the only other one that would place Ainz above any other of the 41 Supreme Beings. Ainz taking over that name was done to raise awareness of the name to lure any potential comrade that might have been transported to that world, a prospect that Albedo seems to not be too fond of since it would lower Ainz authority in her eyes.

Let's say for example Peroroncino ends up being in the new world and joins Nazarick. If he were to order something to Shalltear that would conflict with an order from Ainz, Shalltear would comply with Peroroncino's order. This is not acceptable for Albedo. Momonga's authority should be unshakable in her eyes.