Why is the white bar area not sensitive when enabling the Sidebar on the Xiaomi 15 Ultra?

The issue you're experiencing with the white bar area not being sensitive when the Sidebar is enabled is due to the way the Sidebar feature interacts with the screen's touch response. The Sidebar is a system module designed to provide quick access to various apps and tools. When activated, the white bar serves as the handle to open or adjust the Sidebar.
The lack of sensitivity in this area is not related to a hardware touchscreen issue, but rather how the system allocates space for the Sidebar feature. The touch system will treat the white bar area differently, potentially leading to reduced responsiveness in certain scenarios.
To solve the issue, please refer to the following methods:
Method 1:
1. Press and hold on the white bar of the sidebar;
2. Drag it to another position.
Method 2:
1. Go to [Settings];
2. Search for [Side toolbox];
3. Adjust the opening scenarios of the sidebar or disable [Sidebar].