Use the Probe Path tab > Options panel > Verification Levels option to specify which CAD levels and objects you want to include in collision checking.
To specify which CAD levels and objects are included in collision-checking:

to expand the folders and display the level and object you want to work with.
indicates the entry is included in the verification.
indicates the entry is excluded from the verification.
indicates a parent level that contains a mix of included and excluded entries.
In this example, Face 1~18 and Face 1~26 in Level_1 are excluded from the collision check:

You can also choose which CAD levels and objects are included in the collision-check using the CAD tab.