Right-click the stencil name in the list and select Open Read-Only or simply ensure it is checked so it stays in your side panel for future projects. Quick Tips for GOST Schematics Find more shapes and stencils - Microsoft Support
Finding "GOST Electro for Visio 2016" for free can be tricky, as the official version from TD-Visio is a commercial product. However, there are several ways to get GOST-compliant electrical stencils without paying for the full software package. 1. Free Community Stencils
A major hub for free Visio stencils. While they focus heavily on IT and networking, they often host legacy electrical and engineering packages that are compatible with Visio 2016.
Even if you find a working free version, users report: