There are a few options now.
In the ESPHome configuration that I support, you can disable the ABC entirely so it won’t try to self-correct until you manually initiate it, such as when you can bring the sensors outdoors for awhile.
There is now also support for adding an offset to the reported CO2 values if you know how far off it is, but that is a limit used case.
In this thread:
Disable Automatic Baseline Correction for CO2 - AirGradient Forum
Achim stated that the ability to disable the automatic calibration is coming to the AirGradient Dashboard site and will work with the stock firmware, so you can accomplish a similar thing. Hopefully that is available soon.