2 answers

• 
  Adan Isais over 1 year ago

  When you select a part, it turns blue (or green or orange) but that's not only what happens, if you check closer you'll see, that ther is a orange wireframe cube around it, and that's it, that's why your floor looks below the part.

  1. Step 1

     First you see this:

     

  2. Step 2

     The solution is simple: locate the wheel missaligned (maybe all of them are missaligned) and do what you shouldn't do in regular conditions, add unnecesary mates

     

  3. Step 3

     Now you're wheels are aligned

     

  4. Step 4

     The box is aligned:

     

  5. Step 5

     And your floor is fine:

     

• 
  Robert Stein over 1 year ago

  It can be also achieved (fixed) by right clicking and selecting on "edit scene" and selecting the proper selection of planes (XY XZ YZ) and adjusting the height