Hello everyone !
I am currently having a problem : my frames are "cropped", I mean there is an oragne rectangle appearing on the preview and I really do not understand why. I don't even know if it was there at the start or not.
Help please ! How can I delete that so I have a full size image ?
Thanks in advance !

No problem, just turn off the setting "Set 16:9 Crop on initialization" in the LRTimelapse general settings. Then initialize again.

Once again thanks a lot for your efficient and fast answer !
Worked perfectly !