Can anyone help me to remove the white line in middle of screen on Zbrush?

Cathedgie23 · Apr 2017

Hi, I'm a student at university. I'm studying Game development with Zbrush. I'm fairly new to Zbrush.

I can't figure out how to remove the white line. I don't know how to do it because I have never seen that white line before.

Image: https://us.v-cdn.net/5021068/uploads/editor/tm/y761dekmosex.png

Image: https://us.v-cdn.net/5021068/uploads/editor/aa/amd0gmuhhywc.png

Please, can anyone tell me what it is and how to remove it?