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!