I suppose you are referring to "Lens Profiles"
The lens profiles in LR are located in the "Resources" folder underneath the location where LR is installed. For instance, in Windows 7/10 is:
C:\Program Files\Adobe\Adobe Lightroom Classic CC\Resources\LensProfiles
Inside there you have a folder '1.0' (current version) and inside it there is a sub-folder for every brand/manufacturer. Each folder contains files for every lens profile (there might be 2 files for each lens, one for RAW and one for JPEG).
Go to the desired folder and move or delete the files you don't need/want (I suggest to move them to another location, just in case)
It is very likely that you'll have to repeat the procedure every time you update the software.
Note: ACR has the files in a different location