Xmaru View V1 uses a straightforward control scheme:
Do not use generic search engines. Instead, go to trusted abandonware archives such as Archive.org or OldVersion.com. Search for "Xmaru View." xmaru view v1 download
Solution: Right-click the shortcut > Properties > Compatibility > Change high DPI settings > Check "Override high DPI scaling behavior" and set "Scaling performed by" to System. Xmaru View V1 uses a straightforward control scheme: