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We report the discovery of an intriguing pressure-driven phase transformationin the layered Kitaev-material $\alpha$-RuCl$_3$. By analyzing both the Braggscattering as well as the diffuse scattering of high-quality single crystals,we reveal a collective reorganization of the layer stacking throughout thecrystal. Importantly, this transformation also effects the structure of theRuCl$_3$ honeycomb layers, which acquire a high trigonal symmetry with a singleRu--Ru distance of 3.41\r{A} and a single Ru--Cl--Ru bond angle of 92.8{\deg}.Hydrostatic pressure therefore allows to tune the structure of$\alpha$-RuCl$_3$ much closer to the ideal Kitaev-limit. The high-symmetryphase can also be stabilized by biaxial stress, which can explain conflictingresults reported earlier and, more importantly, makes the high-symmetry phaseaccessible to a variety of experiments.

Pressure-tuning of $\alpha$-RuCl$_3$ towards the ideal Kitaev-limit