Lenses supporting maximum vertical and horizontal AF area of approx.100%(EOS R5/EOS R6)
Solution
With a supported lens attached, the EOS R5 and the EOS R6 are able to achieve focus over an imaging plane of maximum approx. 100%* in the horizontal and vertical directions (as of July 2020).
* Applicable when subject frame is shown while using 
+Tracking and RF lenses (except RF600mm F11 IS STM / RF800mm F11 IS STM and Extender RF), EF lenses (excluding some current products), EXTENDER EF (III) (depends on master lens AF area mode). Some scenes and subjects may not be applicable.
+Tracking and RF lenses (except RF600mm F11 IS STM / RF800mm F11 IS STM and Extender RF), EF lenses (excluding some current products), EXTENDER EF (III) (depends on master lens AF area mode). Some scenes and subjects may not be applicable. RF35mm F1.8 MACRO IS STM
RF50mm F1.2 L USM
RF85mm F1.2 L USM
RF85mm F1.2 L USM DS
RF85mm F2 MACRO IS STM
RF15-35mm F2.8 L IS USM
RF24-70mm F2.8 L IS USM
RF24-105mm F4 L IS USM
RF24-105mm F4-7.1 IS STM
RF24-240mm F4-6.3 IS USM
RF28-70mm F2 L USM
RF70-200mm F2.8 L IS USM
RF100-500mm F4.5-7.1 L IS USM
Extender EF1.4x III / EF2x III + When a lens in this list is the master lens
EF14mm f/2.8L USM
EF14mm f/2.8L II USM
EF20mm f/2.8 USM
EF24mm f/1.4L USM
EF24mm f/1.4L II USM
EF24mm f/2.8 IS USM
EF28mm f/1.8 USM
EF28mm f/2.8 IS USM
EF35mm f/1.4L USM
EF35mm f/1.4L II USM
EF35mm f/2 IS USM
EF40mm f/2.8 STM
EF50mm f/1.2L USM
EF50mm f/1.4 USM
EF50mm f/1.8 STM
EF85mm f/1.2L USM
EF85mm f/1.2L II USM
EF85mm f/1.4L IS USM
EF85mm f/1.8 USM
EF100mm f/2 USM
EF100mm f/2.8 Macro USM
EF100mm f/2.8L Macro IS USM
EF135mm f/2L USM
EF180mm f/3.5L Macro USM
EF200mm f/2L IS USM
EF300mm f/2.8L IS II USM
EF300mm f/4L IS USM
EF400mm f/2.8L IS II USM
EF400mm f/2.8L IS III USM
EF400mm f/4 DO IS II USM
EF400mm f/5.6L USM
EF500mm f/4L IS II USM
EF600mm f/4L IS II USM
EF600mm f/4L IS III USM
EF800mm f/5.6L IS USM
EF11-24mm f/4L USM
EF16-35mm f/2.8L II USM
EF16-35mm f/2.8L III USM
EF16-35mm f/4L IS USM
EF17-40mm f/4L USM
EF24-70mm f/2.8L II USM
EF24-70mm f/4L IS USM
EF24-105mm f/3.5-5.6 IS STM
EF24-105mm f/4L IS USM
EF24-105mm f/4L IS II USM
EF28-300mm f/3.5-5.6L IS USM
EF70-200mm f/2.8L USM
EF70-200mm f/2.8L IS II USM
EF70-200mm f/2.8L IS III USM
EF70-200mm f/4L USM
EF70-200mm f/4L IS USM
EF70-200mm f/4L IS II USM
EF70-300mm f/4-5.6 IS II USM
EF70-300mm f/4-5.6L IS USM
EF100-400mm f/4.5-5.6L IS II USM
EF200-400mm f/4L IS USM Extender 1.4x
TS-E17mm f/4L
TS-E24mm f/3.5L II
TS-E50mm f/2.8L Macro
TS-E90mm f/2.8L Macro
TS-E135mm f/4L Macro