That is the expected behaviour since EOS 3.2. See the “Changes to the User Menu” section of the release notes in https://community.endlessos.com/t/release-endless-os-version-3-2/2794 :
Changes to the User Menu
The user menu has moved from the bottom left of the screen to the bottom right. In its place, the Endless logo on the left will now take you straight to your desktop. Just press the button once to hide all of your open windows and access your desktop – and then press it again to get back to the open windows that you just had.
Hope that clarifies the situation,
Mario