I am facing a challenge while trying to incorporate two AppBar components in Material-UI, stacked one on top of the other. The problem arises when a line appears at the end of the first AppBar, overlapping with the second one. Click here to view an image that demonstrates the issue: image I have attempted to resolve this by adjusting margins and padding values to 0 or -1, however, these adjustments did not seem to affect the outcome. I also experimented with setting aria-hidden to true, but unfortunately, this approach did not eliminate the unwanted line either.