To Scale Windows 10, right click on the desktop, choose "Display Settings"
Under Scale and Layout, change the select box with the title:
"Change the size of text, apps, and other items"
to 175%

My resolution is set to 3840 X 2160

Thanks for filing the issue!

Tried checking the issue on reported chrome version 69.0.3497.100 using Windows 10 Surface Pro, as currently we do not have 4K monitor.
1. Changed the display scale to 175%
2. Resolution : 2736*1824 (Highest available with this machine)
3. Launched Chrome
4. Hovered over the tab, observed the tool tip rendered in normal size.

@Reporter: As we do not have a 4K monitor with us, could you please let us know if this is specific to it. Or is the issue seen on other displays too? Any further inputs from your end may be helpful.

Not sure how being 4k would cause this. It seems to be due to the scaling not being applied to the tabs hover tooltip, but don't know what would cause this. Could be a Windows 10 issue, but it does not occur on the Edge, Firefox or IE11 browsers.

Just tried on my older 1920 X 1200 monitor and it works fine at 175%.
The monitor that is not working is a Samsung U28E590D.

So could be because of 4K or any other difference with this newer monitor.

Thank you for providing more feedback. Adding the requester to the cc list.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

neonguru@ Thanks for the update.

As per comment #4, the issue requires 4K monitor to test and confirm this issue. This monitor is not available at TE end to confirm.
Hence adding 'TE-Hardware-Dependency' label and requesting the appropriate team to look into the issue and help in further triaging.

Thanks...