The study observes stationary current vortices in a monolayer graphene device at room temperature using a nanoscale scanning magnetometer. By measuring devices with increasing characteristic size, the researchers verify the disappearance of these vortices, supporting a prediction of the hydrodynamic model. They find that vortex flow is present in both hole- and electron-dominated transport regimes but disappears near charge neutrality. The reduction in vorticity diffusion length near charge neutrality is attributed to a decrease in the mean free path for momentum-relaxing interactions. The work highlights the effectiveness of local imaging techniques in uncovering exotic mesoscopic transport phenomena.The study observes stationary current vortices in a monolayer graphene device at room temperature using a nanoscale scanning magnetometer. By measuring devices with increasing characteristic size, the researchers verify the disappearance of these vortices, supporting a prediction of the hydrodynamic model. They find that vortex flow is present in both hole- and electron-dominated transport regimes but disappears near charge neutrality. The reduction in vorticity diffusion length near charge neutrality is attributed to a decrease in the mean free path for momentum-relaxing interactions. The work highlights the effectiveness of local imaging techniques in uncovering exotic mesoscopic transport phenomena.