After the steps mentioned by @GameMaster Greatee look under the "Plugins" menu in the main x64dbg window or in the secondary menu in the Disasm window as well for an "xAnalyzer" entry.
If you want to use x64dbg for debugging and at the same time IDA Pro for static analysis, I recommend you one of my favourite plugin: https://github.com/bootleg/ret-sync
You can for example run your binary program in a VM with x64dbg and synchronize it to highlight the current instruction in IDA Pro and much more like auto rebase, controlling/BP from IDA, ...
Calls on x86/x64 are encoded based on how far the target is from the source, not as an RVA into the image. I.e., the number 0x1C88 is a distance, not an RVA. To find the RVA, follow the call to its destination, and then subtract that address by the module imagebase. Then, in IDA, press G and enter 0x140000000+[RVA HERE].