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I've done 5 already. Need to increase the display memory limit through the Citrix policies. There is a formula based on overall resolution, regardless of number of monitors.

These two links will get you going. But 6 is a good bit, and it may be worthwhile to allow it to offload to the client if possible, depending on the hardware of the GPU. https://support.citrix.com/article/CTX115637/citrix-session-graphics-memory-reference?recommended https://support.citrix.com/article/CTX201696/support-for-monitors-including-4k-resolution-and-multimonitors

Is the citrix policy name display memory limit?

Yes - https://docs.citrix.com/en-us/citrix-virtual-apps-desktops/policies/reference/ica-policy-settings/graphics-policy-settings.html#display-memory-limit

The display memory limit policy is ONLY needed for non GPU cases. If you have a GPU, please size it properly as more monitors with high resolutions increase the video ram usage