To have additional features like the full preview, you need to install some external components.
Ghostscript
LogicalDOC uses Ghostscript to render the documents' thumbnails. Ghostscript is available at the following URL: https://ghostscript.com/
At the time of writing LogicalDOC has been tested against Ghostscript 9.53.3 64bit, so we suggest going with it.
After having installed LogicalDOC, remember to enter in Administration > Import and Export > Format Converters, select the GhostscriptConverter and here specify the correct path of the gswin64.exe command(it should be C:\Program Files\gs\gs9.56.0\bin\gswin64.exe ):
