For your reference, here are two methods below:
1. Go to the [Mi Home/Xiaomi Home] APP >> select [Device card] >> tap [...] at the upper right corner >> select [Switch to large card] >> turn on [Set card style as large].
2. Go to the [Mi Home/Xiaomi Home] APP >> press and hold on the [Device card] >> select [More] at the bottom of the interface >> tap [Switch to large card].