Traditionally (that is, the way I was taught when the world was manually drawing schematics and doing layouts with tape), discrete components are labelled top to bottom then left to right on the schematic. Parts like ICs are labelled top to bottom then left to right on the PCB.
The reasoning for doing it that way is to make the ICs easy to identify on the PCB, and since they are big and relatively few they are easy-peasy to find on the schematic. Stuff like resistors, OTOH, are a right pain to find anywhere, so you make it simple to find them on the schematic and then they are easy to locate on the PCB because you know what IC they are close to.
Note that 'find' here typically applies to the checking process that no-one does any more but was invaluable for spotting non-netlist issues as well as connection problems.