Changelog for QGIS 3.20
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* General : Additional options for opening attribute tables

* General : Set size for all columns in attribute table

* General : Export/import of authentication configurations made easy

* General : QGIS 3.20 highlights (changelog)

* Temporal : Temporal navigation steps

* Temporal : Improved WMS-T settings

* Temporal : Horizontal mouse wheel temporal navigation

* Map Tools : Nominatim Geocoder Integration

* User Interface : Processing history dialog improvements

* User Interface : Map layer icons in the expression builder dialog

* User Interface : SVG browser filtering

* Symbology : Interpolated line symbol layer type for vector layers

* Symbology : Trim the simple line symbol

* Symbology : New "Embedded styling" renderer with OGR feature styles support

* Symbology : New shapes and cap styles for ellipse markers

* Symbology : Set cap styles for simple markers

* Symbology : Allow pen cap style to be set for ellipse marker symbol layers

* Symbology : Polygon rings @geometry_ring_num variable

* Labelling : Fill symbols for label background shields

* Labelling : Blending mode settings for label callouts

* Labelling : Anchor line labels by entire line

* Labelling : Balloon callout corner radius

* Labelling : Balloon (speech bubble) callouts

* Labelling : Curved line callout style

* Labelling : Highlight pinned callout start or end points

* Labelling : Auto-creation of callout auxiliary fields

* Labelling : Callout snapping

* Labelling : Toggle label layers shortcut

* Labelling : Data defined callout start and end points

* Labelling : Allow callouts to be interactively moved using the Move Label tool

* Point Clouds : Support for remote datasets (EPT)

* Print Layouts : "Convert to Static Text" option

* Print Layouts : Improvement to XYZ layers previewed in map items

* Expressions : length3D Function

* Expressions : Extended array expression functions

* Expressions : MIME Type expression function

* Digitising : Select attributes from the largest geometry when merging

* Digitising : Streaming digitizing mode

* Digitising : New "Line Endpoints" snapping option

* Digitising : Select vertices by polygon

* Data Management : Layer tree warning icon for layers with CRS inaccuracies

* Data Management : Basic support for dynamic CRS coordinate epoch

* Data Management : Projection information improvements

* Data Management : Datum ensemble CRS warnings

* Data Management : Persist layer metadata in vector file exports

* Data Management : Layer notes

* Data Management : Automatically load .shp.xml metadata

* Data Management : Automatically translate layer data from ESRI Filegeodatabases to QGIS layer metadata

* Data Management : Read field domains from datasets

* Data Management : Allow loading GPKG layers with GEOMETRY type

* Data Management : Offline editing support for string list and number list field types

* Forms and Widgets : Per-field usage of last values for newly created features

* Forms and Widgets : JSON View widget

* Layer Legend : Vector "label" legend entries

* Processing : Add option to save layer metadata to Package Layers algorithm

* Processing : Raster Layer Properties Algorithm

* Processing : Improved rasterize operation with 3D support

* Processing : Save selected option for Package Layers Algorithm

* Processing : Log levels for processing context

* Processing : Geometry snapper rework offers major speed boost

* Processing : Add a last_value function to the aggregate algorithm

* Application and Project Options : Add global option to disable monitoring of directories

* Application and Project Options : APIs for export and import of XML authentication  configurations

* Browser : Custom icon colors for folders in browser

* Browser : OWS Group removed from the QGIS Browser

* Data Providers : Add support for integer, real and integer64 list data types in OGR

* Data Providers : Extend vector layer read capabilities to other layer types

* QGIS Server : External layer opacity

* QGIS Server : Configurable Service URL

* Notable Fixes : Bug fixes by Even Rouault

* Notable Fixes : Bug fixes by Alessandro Pasotti

* Notable Fixes : Bug fixes by Paul Blottiere

* Notable Fixes : Bug fixes by Denis Rouzaud

* Notable Fixes : Bug fixes by Loïc Bartoletti

* Notable Fixes : Bug fixes by Julien Cabieces

* Notable Fixes : Bug fixes by Peter Petrik

* Notable Fixes : Bug fixes by Nyall Dawson