How to make ".ini" files invisible?

You can make it hidden via CSS enabled as a code snippet in the appearance panel
this work for a folder

.nav-folder-title[data-path*="logseq"] {
  display: none;
}

in your case should be something like

.nav-file .nav-file-title[data-path*=".ini"] {
  display: none;
}

Hide Files by Extension - Help - Obsidian Forum

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