Is the 15.6" display full HD, and does it have any special features like anti-glare or high refresh rate?

The display is 15.6 inches FHD (1920 x 1080) but there is no mention of special features like anti-glare or high refresh rate.

Does this laptop support dual-channel memory, and can the RAM be upgraded from 16GB?

Yes, the laptop supports dual-channel memory as it has 2 sockets for RAM and can be upgraded to a maximum of 64GB.

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MSI GF63 Thin 9SC-066 15.6" Gaming Laptop, Thin Bezel, Intel Core i7-9750H, NVIDIA GeForce GTX1650, 16GB, 512GB NVMe SSD

Display: 15.6 inches Fhd (1920 x 1080), IPS-Level 60Hz 45 percent ntsc thin Bezel 1920x1080 16:9
Graphics: NVIDIA GeForce GTX1650 [Max-Q] 4G GDDR5
Processor: Intel Core i7-9750h 2.6 - 4.5GHz
Memory: 16GB (8 gram x 2) DDR4 2666MHz 2 Sockets; Max memory 64GB
Storage: 512GB NVMe SSD