Anti-realists do accept the beliefs other minds exist when no one is "looking" at them.
But, anti-realists [nb: Kantian] believe in the various perspectives of reality, i.e. common-sense, conventional sense empirical reality, ultimate anti-philosophical-realism [not mind-independent].
Whilst anti-realists do use terms with the 'ism' suffix, they do not cling to any of the above perspectives of reality as an
ideological 'ism' dogmatically in surrendering to the evolutionary default.
Anti-realists [nb: Kantian] like all humans are embedded with the evolutionary default of externality and mind-independence which is necessary for basic survival, but [as stated above] they do not cling to any of the above perspectives of reality as an
ideological 'ism' dogmatically in surrendering to the evolutionary default.
As such, in the basic common conventional sense of reality, the Anti-realists [nb: Kantian] do not insist when they turn their back to the oncoming train on the track they are standing on, the unobserved oncoming train do not exist independent of mind.
Whatever perspective of reality the anti-p-realist accept, the ultimate reality is conditioned upon a human-based FSR-FSK, thus it follows, ultimately there CANNOT be an absolutely mind-independent reality.
Because the Anti-realists [nb: Kantian] do not subscribe or be dogmatic on externality and mind-independence as an ideology [due to psychological weaknesses within] they are able to switch to a more refine perspective of reality whereby reality CANNOT be absolutely mind-independent as the dogmatic p-realist insist upon ideologically.
This is like seeing the other of the 2 cubes in the Necker Cube Exercise, whereas the p-realist can only see 1 cube and never be able to cognize the 2nd cube.
Because the Anti-realists [nb: Kantian] has to option to switch between different perspectives of reality, they are able break off from the chains of p-realism to contribute to a greater state of well-being and progress of humanity, e.g. potentially from Buddhism's 'nothingness' QM non-local-realism, etc.
Note this perspective of reality which Einstein the hardcore p-realist rejected;
The Moon Does Not Exist If No Humans 'Look' at It
viewtopic.php?f=8&t=39510
Since the ideas that Einstein rejected has won the 2023 Nobel Prize.
My point;
Anti-realists do accept the beliefs other minds exist when no one is "looking" at them.
However, for pragmatic reasons, anti-p-realists do not cling to the above dogmatically as an ideological 'ism'.
Anti-p-realists believe there are other perspectives of reality subject to their specific human-based FSK.