MacBook Pro (Retina, 13-inch, Late 2013)
one the left side of the trackpad is not clicking like the right
MacBook Pro 13", macOS 10.15
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User setting
>System Preferences>TrackPad make changes here.
YOu can try Try resetting NVRAM/PRAM http://support.apple.com/kb/ht1379
A swollen battery can adversely effect the trackpad—you can inspect external for any sign of case seperation.
Alternatively: In or out of warranty you can get a free over the counter 'Apple Service Diagnostics' test /assessment
Make an appointment for a "hardware issue"—
https://www.apple.com/retail/geniusbar/