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Monolayer group VI transition metal dichalcogenides (MX₂ group, where M is W or Mo and X is S, Se or Te) host novel electronic phases including a 2D quantum spin Hall (QSH) state in the 1T’ structure. The 1T’ phase has three orientational variants. Using scanning tunneling microscopy, we induce strain on monolayer 1T’-WSe₂ islands, which results in switching between these three orientations and creates grain boundaries between two topologically nontrivial 1T’ domains. The electronic structure of these grain boundaries is then explored via scanning tunneling spectroscopy and compared with calculations of confined electronic modes on the grain boundary.