LibreOffice looks just plain ugly [closed]

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I've only ever used Ubuntu, Raspbian and Android as far as Linux is concerned, and all of these have some sort of appstore. If you take a look on some software repos for Fedora like apt uses in Debian/Ubuntu

I'm not sure what your exact aesthetic goal is, but besides themes, you can change some of the appearance of LO by trying different icon styles. These are (or should be) available under Tools->Options->LibreOffice(left pane)->View(left pane)->(right pane)Icon Size and Style, right drop-down. If there's only one style available you will need to install more.

On my Debian/Ubuntu based systems, non-default icon styles are installed from Apt packages with a naming convention of libreoffice-style-*, where * is oxygen, galaxy, tango, crystal, human, sifr, etc. Tango was the default on most installs until recently, and the one I prefer, giving a more familiar 3D color look to LO icons. I'm not sure how it works under Fedora, you may have some styles already, or they may be under different package names.

I recommend especially to change the style of icons on Galaxy - maybe it will be downloaded through synaptic. Note that the setup program, you must choose a size as small icons. Further recommend you to choose a theme - like mentioned Adwaita or Clearlooks, but that is to be downloaded from the internet. I personally prefer the Oxygen style because I use KDE, but it makes the problem directly in the terminal in Ubuntu (I don´t know what will be happened in Fedora). Unfortunately GNOME themes and style is not (at least for me) (only) visually satisfying, so I use Kubuntu. If I can advise, go to KDE.