Canon EOS Rebel SL3 DSLR Camera with 18-55mm Lens (Black) - Manual (Page 159)

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e
Center-weighted average metering
The metering is averaged for the entire scene with the
screen center weighted more heavily. This metering
mode is for advanced experts.
z With q (Evaluative metering), the exposure setting will be locked when you
press the shutter button halfway and focus is achieved. In the w (Partial
metering), r (Spot metering), and e (Center-weighted average metering)
modes, the exposure is set at the moment the picture is taken. (Pressing the
shutter button halfway does not lock the exposure.)