It's all fine using F6 unless F6 is used for something else. In my case, F6 pauses my SmartNav. Saying, F6 again, unpauses my SmartNav. If you are lucky enough to have a SmartNav and you cannot use your hands, you can just click the split screen using the SmartNav.
I know you can probably assign another function number for this method. However, you have to be careful because others function keys perform other functions.
Cheers
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Tiger Feet
| DPG 15.7.1 | KnowBrainer 2020 | Windows 10 Professional /64 Bit | Intel® Core™ i9 Ten-Core Processor i9-10900K (3.7GHz) 20MB Cache | 32GB RAM. | 250GB SAMSUNG 970 EVO PLUS M.2, PCIe NVMe SSD (up to 3500MB/R, 2300MB/W) Boot Drive | 1TB SAMSUNG 970 EVO PLUS M.2, PCIe NVMe SSD (up to 3500MB/R, 3300MB/W) Storage Drive | Sennheiser D10 USB Wireless Microphone