A friend just gave me his i7 Lenovo IdeaPad 710S . I was hoping to make it a Linux machine. However, I'd like it to be dual-boot for a couple work programs. All my research says that there was a BIOS problem with this machine where Linux installs did not recognize the hard-drive. Lenovo responded with a BIOS update that enabled Linux at the expense of Windows. Basically, it was either/or for the OSes with this machine. Much of the info I found was from 2016-18. Anyone know if things have changed since then, and if dual-boot is possible on this machine?

Processor
Intel Core i7-6560U 2 x 2.2 - 3.2 GHz (Intel Core i7)
Graphics adapter
Intel Iris Graphics 540, Core: 1050 MHz, shared Memory, 20.19.15.4364
Memory
8192 MB , LPDDR3, 1866 MHz, Dual-Channel, soldered
Display
13.30 inch 16:9, 1920 x 1080 pixel 166 PPI, Sharp SHP 1447 / LQ133M1JW15, IPS, glossy: no
Mainboard
Intel Skylake-U Premium PCH
Storage
Samsung PM951 NVMe MZVLV256, 256 GB
Weight
1.16 kg ( = 40.92 oz / 2.56 pounds), Power Supply: 170 g ( = 6 oz / 0.37 pounds)

Lenovo have done some monumentally stupid things - that' s plural. Windows (which version ?) will happily install/run on ACHI disks - but I'm more than willing to believe they shipped a version that will only run in the RAID mode.
You might be able to get away with downloading M$ofts Win10 iso image and install that using the Lenovo licence key - or maybe not. Create a system image backup before you start playing around.

If Win10 is a must have, WSL2 is a supported means of running Linux under windows - will even run a desktop these days. Else virtaulbox/hyper-v/VMware for a "full" virtual environment for a linux guest.

A number of uefi machines are configured to disable access to the NVMe if one puts it in legacy /csm mode.

Use a secure boot uefi aware distro.

It's not a secure boot issue, but Intel RST support. Thinking about this, ISTR the kernel devs fixed this, but I've never bumped into it to test. Looks like Intel is becoming a never ending problem - see this for example.

Thanks for the responses. I got this machine free (supposedly dead) to use as a Linux laptop if I could fix it. I plugged it in and it powered right up and works fine. I wiped and did a clean windows install. I can make it a Linux only machine, but would prefer to have both OSes. I am having trouble getting the camera working, but certain it is a driver problem. However, that got me thinking, with Linux (Mint), might there be a problem finding drivers for all the components in the machine?

Easy enough to check - fire up Mint in live mode and have a look. Generally given the Ubuntu heritage, Mint is pretty good with support for hardware, especially if you turn on the proprietary support. It'll also allow you to see if the RAID disk(s) are detected, and what is presented if it is.