That's intentional, as the "All" options calculates all available sensitivity values for you. This is to make it easier and less tedious to calculated for instance all aims for games like BFV, so instead of going through each and every aim you do it in one go with the "All" option. For Apex this means that the aim sensitivity you select with "All", like "All w/ADS" or "All w/ 1X" will be calculated based on your conversion setup.
If you want to convert directly from ADS to ADS your screenshot is showing the correct way. You just need to enter whatever you have configures as Sensitivity 1 for R6, be it the default value of 50 or something else. The ADS sensitivity needs this value to be able to be calculated. This and the configured FOV for R6 and Apex (if they are changed from default) is all that is missing from your calculation.