Menu > File > Open Recent > [ ... ]
The following are requests for the "Open Recent" section under the "File" menu, to help improve the user's ability to find recent projects.
In macOS you can preview a file by selecting it and hitting the spacebar. Unfortunately, Affinity files are not optimized to utilize the typical screenspace used by other image filetypes such as .jpg, .png, .psd, etc. Here is a comparison of the preview screen area.