When you found a PCB Libs(footprint) but it can not be satisfied for your design, you can edit it to be your personal PCB library.
Via Libraries > Type: PCB Lib > Search Component/Personal/LCSC/System > Select footprint > Edit
You can edit the pad size, shape outlines, etc. when you finish and save, it will be saved to your personal libraries “Created” and become your personal libraries.
And you can add a tag for your PCBLib when you save it:
Modify the saved PCBLib tag: Libraries > Type: PCB Lib > Personal > Select footprint > Right Click > Modify
About the tag suggest that using as below:
AXIAL: AXIAL-0.3 etc.
SDIP：small dual in-line package
SIP: single in-line package
ZIP: zig-zag in-line package
TO-92: Transistor Outline 92
TO-220: Transistor Outline 220
QFP,MQFP,PQFP: Quad Flat Pack
TQFP：Thin Quad Flat Pack
VQFP: Very Fine Quad Flat Pack
PSOP: Plastic Small Outline Pack
SOIC: Small Outline IC, narrow/wide
VSSOP,SOIC: Miniature small Outline IC
SOD123,SOD323,SOD523: Small Outline Diode
SOT23,SOT223,SOT3X3,SOT523,SOT563: Small Outline Transistor
TSOT,TSSOP: Thin Small Outline Package
SSOP: Shrink Small Outline Package
DFN,SON: Dual Flat No-lead
QFN: Quad Flat No-lead
TQFN: Thin Quad Flat No-lead
SOJ: Small Outline IC, J-lead
PLCC: Plastic Leaded Chip Carrier
JLCC: J-Lead Chio Carrier
SMD: Chip resister, Chip capacitor
MELF: Metal Electrode Leadless
If you want to edit a package(footprint) in the PCB, you can use the Ungroup/Group function same as the schematic.
On the PCB Tools palette there is the Group/Ungroup Symbol… button.
This tool is for you to quickly create or edit library symbols.
Select a package(footprint, PCBlib)
Click the Group/Ungroup Symbol… button
Up to this point you have a collection of separate pads, a drawn silk layer tracks and some text that are all separate items with no particular association with each other.
Edit the shape or pad what you want to change
Select all of the items and click the Group/Ungroup Symbol… button.
A dialog will be opened:
After you click OK, all those separate elements will be grouped together to form your new symbol directly in the PCB.
Using the group function, you can create/edit any symbol in the Schematic/PCB, easily and quickly.