Your Lenovo LOQ 15.6" laptop has two RAM slots. If 16 GB of RAM is currently installed, either a single 16 GB module or two 8 GB modules could be used.
If only one slot is occupied, you can simply install an additional 16 GB module and upgrade to 32 GB. If both slots are already in use (e.g. with 2 × 8 GB), you would have to replace both modules with 2 × 16 GB. Important:
Use DDR5 SO-DIMM modules with 4800 MHz so that everything runs smoothly. If you install it yourself, be careful or have it done by a professional.