Finding one setting in a file

Drop the file on preslice and read it off the Content tab. The nozzle temperature, layer height, infill and wall count are on the print cards; every other setting is one search away in the same tab.

How do I read the nozzle temperature?

Open the file and look at the thermal card on the Content tab. It shows the nozzle temperature per filament slot, in °C, next to the bed temperature, because a file with four filaments loaded usually has four different values.

The card reads whichever key the slicer that wrote the file used. PrusaSlicer writes temperature, Bambu Studio and OrcaSlicer write nozzle_temperature, and Cura writes material_print_temperature. You do not need to know which: the card is labelled by what the value is, not by what the slicer called it.

How do I find a setting that is not on a card?

Search for it. The Content tab has a search field over every setting in the file, and it matches both the readable label and the real key, so infill and sparse_infill_density both find the same row.

If you know the key name but not what it does, Print settings by name has a page per setting: what it controls, what each of the five slicers calls it, and the values each one accepts.

What if the setting is not there at all?

Then the file does not carry it, which is itself an answer.

Usually the file has no print settings at all. A .3mf exported from CAD, or downloaded from a model site, is geometry alone: there was no slicer, so there is no profile, and preslice says so rather than showing an empty card.

Sometimes the slicer left it out on purpose, because some of them omit a key whose value matches their own default. The absence means "whatever this slicer's default is", not "zero".

And a .gcode.3mf from Bambu Studio, OrcaSlicer or Creality Print carries the toolpath rather than the profile that produced it. 3MF against G-code covers the difference.

Can I read the raw value instead?

Yes. The Raw tab shows every member of the archive as text, with search across all of them, so you can read the config part itself. For a PrusaSlicer file that is Metadata/Slic3r_PE.config; for Bambu Studio, OrcaSlicer and Creality Print it is Metadata/project_settings.config; Cura writes into the model XML. Print settings in a .3mf has the full layout, and the container itself is defined by the 3MF Core Specification.

Can I change the value while I am here?

Yes, and the file on your disk stays as it was until you export. Editing a file covers what a change looks like and how to undo one.