Cheat Engine

[zIa1yBX5]

I've checked that the platform of cheat engine and attached process (Solitaire.exe) are all 64-bit.
When I open the memory view form, I only see 32 bit address on the left.
I attach a snapshot for better understanding.

By the way, I use the "allocate memory" in the "tools".

[ParkourPenguin]

CE formats addresses using at least 8 hex characters, padding the start with zeros if necessary. Extra leading zeros are implicit
03E0FFFE == 0000000003E0FFFE

Same thing with the addresses in the hex view. They aren't 6-byte addresses; they're 8-byte with implicit leading zeros
7FF63902F000 == 00007FF63902F000

[zIa1yBX5]

[Dark Byte]

[Christopher1080]

are you sure you’re using the 64-bit version of Cheat Engine. maybe try reinstalling or downloading a newer version?