Logic Pro doesn't include EXS24 anymore. Logic Pro had an update and ESX24 has been replaced with \\"Sampler\\". You can still play instruments, your previous sample library, and any .exs format instruments from EXS24 in the new sampler. If you're on a newer version of Logic you will not have access to the old layout however the new sampler layout is more streamlined and intuitive than the old EXS24 one – but still very fiddly and quite hard to navigate.