Known issue with the Intel® Arc™ Control where it shows incorrect resizable bar status for Intel Arc Graphics.
In Intel® Arc™ Control under Settings > System Information > GPU Info, it shows a resizable bar supported status as "Yes" for iGPU and a resizable bar supported status as "No" for Intel® Arc™ Graphics.
This issue is resolved in Intel® Arc™ Control version 1.0.4765.0 and newer versions. The Resizable bar support category is removed from the GPU info section to the General info section on the system info page in the Intel Arc Control Panel.