  Highly tunable properties make Mn(Bi,Sb)$_2$Te$_4$ a rich playground for
exploring the interplay between band topology and magnetism: On one end,
MnBi$_2$Te$_4$ is an antiferromagnetic topological insulator, while the
magnetic structure of MnSb$_2$Te$_4$ (MST) can be tuned between
antiferromagnetic and ferrimagnetic. Motivated to control electronic properties
through real-space magnetic textures, we use magnetic force microscopy (MFM) to
image the domains of ferrimagnetic MST. We find that magnetic field tunes
between stripe and bubble domain morphologies, raising the possibility of
topological spin textures. Moreover, we combine in situ transport with domain
manipulation and imaging to both write MST device properties and directly
measure the scaling of the Hall response with domain area. This work
demonstrates measurement of the local anomalous Hall response using MFM, and
opens the door to reconfigurable domain-based devices in the M(B,S)T family.
