There should not be any restriction on a digital PDF size produced by AC. AC comes with an internal PDF maker. The size is governed by your master layout size. Choose or set the master layout sheet size first and then add your graphics onto it.
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AC26 USA on 16” 2019 MBP (2.4GHz i9 8-Core, 32GB DDR4, AMD Radeon Pro 5500M 8G GDDR5, 500GB SSD, T3s, Trackpad use) running Ventura OS + extended w/ (2) 32" ASUS ProArt PAU32C (4K) Monitors