Unlike reapportionment which determines the total number of representatives per state based on population. square adjusts the size and shape of congressional districts

The process you're referring to is called redistricting. Unlike reapportionment, which redistributes the total number of representatives among states based on population changes recorded by the census, redistricting is the process of adjusting the boundaries of individual congressional districts within each state to ensure roughly equal populations and potentially to address changes in population distribution or demographic shifts. Redistricting is typically conducted by state legislatures or independent commissions following each decennial census in the United States.