feat(docs): quick overview of options

docs/User Guide/User Guide/Basic Concepts and Features/UI Elements/Options.md

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+# Options
+![](Options_image.png)
+
+The Options section allows the configuration of the TriliumNext client and server.
+
+## Entering options
+
+The Options can be accessed via:
+
+*   The [Global menu](Global%20menu.md), by selecting the _Options_ item.
+*   The ![](1_Options_image.png) button in the [Launch Bar](Launch%20Bar.md) which can optionally be hidden if not desirable.
+*   Optionally, a keyboard shortcut can be defined, but it is not assigned by default.
+
+Once in the options section, simply select one of the option categories using the [Note Tree](Note%20Tree.md).
+
+## Exiting options
+
+When entering the options, they are opened in a new [tab](Tabs.md). To close them, simply close the tab.
+
+## Options when using sync
+
+When using [Synchronization](../../Installation%20%26%20Setup/Synchronization.md), some of the options will be kept in sync across all the devices while others can be changed independently.
+
+Generally, the options that relate to appearance are intentionally kept not synced in order to allow per-client customization (layout orientation, theme, vertical/horizontal layout, code block themes).