2 layers49.8 × 49.8 mm

The FSM2JSMA is a tactile Switche made by TE Connectivity in a SMD-4P,6x6mm package with 4 pins.
293 are in stock at JLCPCB (part C7193797). 1 open-source board in 1 repository on GitHub use it.
The library has no symbol for this part yet.
The library has no footprint for this part yet.

SMD-4P,6x6mm, with 4 pins.
TE Connectivity publishes it: the Datasheet link on this page opens it.
JLCPCB lists it as part C7193797, with 293 in stock; the sellers' links on this page open their listings.
1 board in 1 repository on GitHub; the most starred are listed on this page, with their KiCad files.