UIXpress 1.2.15 - Site Switcher Breaks Menu Rendering and Becomes Unusable

Issue Description

UIXpress version 1.2.15 has critical menu rendering issues when used with MainWP Dashboard:

Problem:

1. Upon activation, the UIXpress menu doesn't render properly - appears as a black/empty sidebar area

2. When attempting to use the UIXpress site switcher feature to switch between sites, the menu completely disappears

3. This makes the entire admin interface unusable as navigation is lost

4. Hard refresh does not restore the menu

Steps to Reproduce:

1. Install UIXpress 1.2.15 on MainWP Dashboard

2. Activate the plugin

3. Observe menu renders as black/empty

4. Click the site switcher in UIXpress

5. Menu completely breaks and cannot be recovered without deactivating the plugin

Environment:

• Plugin: UIXpress 1.2.15

• Setup: MainWP Dashboard (client management dashboard)

• The plugin should show menu items but only displays empty black sidebar area

Expected Behavior:

Menu should render with all navigation items properly visible and the site switcher should work without breaking the interface

Actual Behavior:

Menu fails to render and using site switcher causes complete interface breakdown