After installing the Windows preview update KB5095093, I noticed Windows PowerShell ISE is displayed as Windows PowerShell ISE 5.1. I couldn't find a mention of the rename in the release notes. Did the update change it, or was it already called that?
Why does PowerShell ISE now show up as version 5.1?
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recalculate-then-nap
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The timing makes the update a plausible cause, but it doesn't establish what changed or why. Another installation can still show the shorter name, so the label isn't necessarily the same everywhere.
Check the shortcut under C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Windows PowerShell. A shortcut named Windows PowerShell ISE 5.1.lnk would explain that display name without necessarily indicating a change to ISE itself. Comparing the shortcut before and after the update would be stronger evidence of the cause.
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Adding 5.1 to the name would make sense as a way to distinguish Windows PowerShell from PowerShell 6 and later. That said, there's no stated reason for this particular rename in the information here, so that's just a possible explanation.
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The new label doesn't by itself mean ISE has gained PowerShell 7 support. ISE isn't in active feature development and doesn't support PowerShell 6 or later. It remains a Windows component supported for security and high-priority servicing fixes. Visual Studio Code is an alternative for newer PowerShell versions.
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recalculate-then-nap:
I found a shortcut with the 5.1 name there, along with one for the 32-bit variant.