Before the pandemic Fiserv had many small offices. Those offices have been closed down. Instead of being separated in multiple buildings in multiple locations across the country, Fiserv is requiring all associates to work in a select few buildings.
Before the pandemic Fiserv had cubicles. Little rooms with walls that help absorb sound. Now Fiserv has tables which reflect sound and nothing gets absorbed. Also, Fiserv didn't bother counting the number of seating locations (or parking spots) before requiring a certain number of employees to be in one building. This makes employees sit much closer together than they did before. A microphone may only pick up a voice that is within a few feet of it, but now multiple people are within range.
Honest Answer: Fiserv was configured as a functioning company prior to the pandemic. That is what has changed.