Each version of the Betaflight Configurator is configured to work with a certain subset of firmware for the flight controller. The Configurator's user interface (UI), options/settings/functions/features available via the UI, ranges, default settings/tuning, and the terminology/nomenclature (even for a feature/function that used to be the exact same function) changes between major releases/versions. There is no 100% backwards compatibility. As such, you MUST use the correct Configurator version for the firmware version on your drone. This simply a necessary evil when enjoying Betaflight's open source application and firmware.
Use Betaflight Configurator 10.4.0 for firmware versions 3.x.x.
https://github.com/betaflight/betaflight-configurator/releases/tag/10.4.0
Use Betaflight Configurator 10.5.1 for firmware versions 4.0.x.
https://github.com/betaflight/betaflight-configurator/releases/tag/10.5.1
Use Betaflight Configurator 10.6.0 for firmware versions 4.1.x.
https://github.com/betaflight/betaflight-configurator/releases/tag/10.6.0