Noob Question: Symmetrized my bones, but Weight Painting is still mirrored? So I am currently trying to weight paint the lips on my model such that they deform according to my Lip bones. I used Symmetrize to ensure that there are .L and .R groups, and the Mirror Modifier on my mesh has Vertex Groups checked. But when I go into Weight Paint mode and select one of these .L or .R bones, the weight painting is symmetrical. I would like it to be such that a bone on the right only influences vertices on the right. How may I go about achieving this?

Link to .blend file:
https://drive.google.com/file/d/1QuQFWPfEyLrBtm0oP8SSyCSxa-LeHZ24/view?usp=sharing
Thank you for your help!
The mesh object does not have enough vertex groups for the deformed bone names.
The results of searching with the keyword &quot;Lip&quot; are shown in the Vertex Groups List in the figure.
Select Mesh Object, then Armature in Object Mode. Press the Ctrl+P key and select With Empty Groups.

PS: Lip2C.L is a non-deformed bone name and can be removed from the list.