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White/Gray Horizontal Bar on second monitor

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iwansutedja
iwansutedja
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Hello, I just replace my GeForce 210 to Radeon RX550 and I use 2 monitors (main monitor is 24" and second monitor is 40"), and I just realized that when I maximize Firefox window there is a white/gray horizontal bar on bottom side of second monitor. I tried with other apps and white/gray bar doesn't appear only on Firefox.

This thing was never happened before when I use GeForce 210. Do you think you can help me out? thank you.

Hello, I just replace my GeForce 210 to Radeon RX550 and I use 2 monitors (main monitor is 24" and second monitor is 40"), and I just realized that when I maximize Firefox window there is a white/gray horizontal bar on bottom side of second monitor. I tried with other apps and white/gray bar doesn't appear only on Firefox. This thing was never happened before when I use GeForce 210. Do you think you can help me out? thank you.
Attached screenshots