PP3DP UP! mini User Manual page 18

TIP: You can open several models and print them all at the same time. Just
repeat the open model procedure for each model you want to add. See the
―Placing models on the build platform‖ section for more information.
Unloading the model: click the left mouse button on the model to select it,
and then click ―Unload‖ on the toolbar, or click the right mouse button while
over the model and a context menu will appear. Choose unload the model or
unload all models (if you have more than one file open and want to remove all
of them).
UP! mini 3D Printer User Manual
(Windows version)
(Mac version)
3.Opeation
17