Rapid variation of the RM at millimeter wavelengths in Sgr A^*. The plot corresponds to the RM fit with linear regression across all four bands on 4 s cadence, smoothed with a Gaussian filter with 6 min standard deviation, with color bands around the mean RM indicating the local signal standard deviation. Dashed lines represent the mean daily values reported by Goddi et al. (2021). We observe rapid swings of the RM on timescales ∼0.5 h, indicating a presence of the intrinsic Faraday screen component corresponding to the innermost region of the accretion flow. The vertical gray and red bands indicate the time range of the X-ray flare and polarimetric loops observed on 2017 Apr 11.