Thanks for the posting!
We cannot reproduce the issue locally with Intel HD530 GPU. So I cannot tell what's the issue you hit with 4k display. May you please provide more information so that can help us investigate:
1. Which WS version you installed? 12.5 or 12.1.1?
2. Have you upgraded the GPU driver to latest? What's the current driver version on Host?
3. Does the autofit works on guest? When you setting from menu View -> Autosize -> Autofit Guest/Autofit windows
4. Would you please collect logs by below steps:
1) In guest OS, run notepad.exe as administrator.
Edit file %PROGRAMDATA%\VMware\VMware Tools\tools.conf (create an empty file if it does not exist), set logging level as below:
[logging]
log = true
# Enable tools service logging to a file.
vmtoolsd.level = debug
vmtoolsd.handler = file
vmtoolsd.data = c:/tmp/vmtoolsd.log
# Enable 'vmsvc' service logging to a file.
vmsvc.level = debug
vmsvc.handler = file
vmsvc.data = c:/tmp/vmsvc.log
# Enable VMwareResolutionSet.exe logging to a file.
vmresset.level = debug
vmresset.handler = file+
vmresset.data = c:/tmp/vmresset.log
# Enable new "vmusr" service logging to a file.
vmusr.level = debug
vmusr.handler = file
vmusr.data = c:/tmp/vmusr.${USER}.log
# Set the following configuration if you want to collect the logs for vmware-toolbox-cmd utility
toolboxcmd.level = debug
toolboxcmd.handler = file
toolboxcmd.data = c:/tmp/vmtoolboxcmd.log
# Enable old VMwareUser/vmware-user logging to file.
log.file = c:/tmp/vmtools.log
Create C:\tmp directory if it does not exist. Then reboot guest OS to ensure above settings take effect.
2) Do the operations to reproduce the full screen issues, and then collect all logs shows in C:\tmp
3) Collect the VMware.log and UI log (From menu Help -> About Workstation 12 Pro you can get the location info).
.