Add Option "Lock Model Postion",You can find it by right click tray icon and select menu item "Preferences">>"Model". If you Enabled the option "Lock Model Postion", Models will dance in place.
Right Click Tray Icon Select Menu Item "Manage Model"
Click the "New Model" Button at Top-Mid
Drag and Drop .VRM file to Model Edit Window, Click OK, Enjoy.
PS: The VRM models has great physical effects, and the hair and clothes of models will not be stiff due to the scale, You can try with this VRM girl model: https://3d.nicovideo.jp/works/td32797