Some objects are locked by me to not allow them to move.
You can unlock them by doing these steps:
1- Click on this icon to open the instances list
2- In the instances list, you can search/select the object you want to unlock
3- Now you can move the object after it being unlocked.
Notes:
This icon mean the object is unlocked and you can move it.
This icon mean the object is locked can't be moved but can be selected.
This icon mean the object is locked, can't be moved and can't be selected.