Changelog for QGIS 3.18
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* General : QGIS 3.18 highlights (changelog)

* User Interface : Hide derived attributes from the Identify results

* User Interface : Close all tabs at once from message logs interface

* User Interface : API for layer source widgets

* User Interface : GUI for dynamic SVGs

* User Interface : Zoom and pan to selection for multiple layers

* User Interface : Zoom in/out by scrolling mouse wheel over map overview panel

* Accessibility : Improved color vision deficiency simulation

* Accessibility : Rotation widget for the Georeferencer

* Symbology : Data defined overall symbol opacity

* Symbology : Open the style gallery from the style manager

* Mesh : New mesh export algorithms

* Mesh : Native export for mesh layers

* Mesh : Mesh simplification for 3D

* Mesh : Multiple native mesh processing algorithms

* Rendering : "Merged feature" renderer for polygon and line layers

* Rendering : Smarter Map Redraws

* 3D Features : Eye dome lighting

* 3D Features : Data defined 3D material colors

* 3D Features : 3D Orthographic projection support

* Point Clouds : Point Cloud Support

* Point Clouds : Add point clouds to browser

* Point Clouds : Untwine PDAL Provider Integration

* Print Layouts : Gradient ramp based legends

* Print Layouts : Color ramp legend improvements

* Print Layouts : Dynamic text presets

* Expressions : Optional formatting of UUID results

* Expressions : Layer CRS variable for expressions

* Expressions : Support for min, max, majority, sum, mean, and median functions on numerical arrays

* Expressions : Negative index for array_get function

* Expressions : Add map_credits function

* Digitising : Select features context menu

* Digitising : Curve tracing settings added to UI

* Digitising : Feature scaling tool

* Data Management : New export to spreadsheet algorithm

* Data Management : Reproject coordinates in the Georeferencer

* Data Management : Polymorphic relations/ Document management system

* Forms and Widgets : Soft and hard constraints in forms

* Analysis Tools : Nominatim geocoder API

* Processing : Allow expression for order fields in PointsToPath algorithm

* Processing : Override CRS for Clip Raster by extent output

* Processing : Add "retain fields" algorithm

* Processing : Reference common field parameter for multiple layers

* Processing : Extend import geotagged photos to include exif_orientation

* Processing : Export layer information algorithm

* Processing : Cell stack percentile and percentrank algorithms

* Processing : Points to lines processing algorithm

* Application and Project Options : Hidden layers

* Application and Project Options : Custom "Full Extent" definition

* Application and Project Options : Toggle network caching to QgsNetworkAccessManager

* Browser : Unify ArcGis Feature Service and ArcGIS Map Service connections in browser

* Browser : Allow browsing ArcGIS REST by content groups

* Data Providers : Native DXF export algorithm

* Data Providers : Additional geometry types for PostGIS Export

* Data Providers : Improved network requests with GDAL

* Data Providers : Read only generated fields

* Data Providers : Improve MSSQL loading with predefined parameters

* Data Providers : Filter schemas for MS SQL

* Data Providers : SAP HANA database support

* Data Providers : Deprecate support for DB2

* Data Providers : Oracle connection API

* Data Providers : Add advanced options for raster data imports

* QGIS Server : GetLegendGraphics Symbol Scale

* QGIS Server : Drag and drop for WMS GetFeatureInfo response

* Programmability : Run multiple items from command history dialog

* Programmability : Enable or disable plugins from the command line

* Notable Fixes : Bug fixes by Alessandro Pasotti

* Notable Fixes : Bug fixes by Peter Petrik

* Notable Fixes : Bug fixes by Even Rouault

* Notable Fixes : Bug fixes by Julien Cabieces

* Notable Fixes : Bug fixes by Nyall Dawson