Components
“RES-TH_L8.0-W5.4-P5.00-D0.6”, by meaning
A component is a schematic symbol with, where the catalog has them, its footprint and 3D package model — linked by KiCad's own references and cross-checked pin by pin.
Searching by meaning…
Matching “RES-TH_L8.0-W5.4-P5.00-D0.6” on what it describes rather than on names. This takes a few seconds.