I'm seeing this to be an Insider build so report bugs with Insider builds to Microsoft. That's why they issue these builds. So you can find bugs and report.
My Windows 10 laptop (v1607, Build 14393.105) is losing free hard disk space and won't let me change the necessary settings to stop it.
I went to Control Panel > All Control Panel Items >File History > Advanced Settings
Here's what I found:
Save copies of file: Every hour
Keep saved versions: Forever
I made the following changes:
Save copies of files: Daily
Keep saved versions: 1 month
I clicked Save Changes button at the bottom of the screen and closed the dialog.
I went back to Control Panel > All Control Panel Items >File History > Advanced Settings and the original settings were back.
I clicked on the Open Event Log down below. I get a prompt telling me it's creating a snap-in, which fails every time.
My hard disk's free space is getting smaller and smaller. I don't need this! If I want to back up my data, I'll do it manually. How do I fix this problem?