If you keep the 'normal' preloaded draft and work from there, you will be using the two-column style. This is perfectly fine in most cases and you don't need to do anything.

However, every time you have a |fullwidth=no and change it to |fullwidth=yes (or vice-versa), the article will take that style from that point onwards (|fullwidth=yes → full width, |fullwidth=no → two-column). By default, omitting |fullwidth= is the same as putting |fullwidth=no and the article will have two columns after that. Again, this is perfectly fine in most cases, and you don't need to do anything.

However, you can also fine-tune which style is used at which point in an article.

To switch from two-column → full width style midway in an article, insert

{{Wikipedia:Wikipedia Signpost/Templates/Signpost-block-end-v2}}
{{Wikipedia:Wikipedia Signpost/Templates/Signpost-block-start-v2|fullwidth=yes}}

where you want the switch to happen.

To switch from full width → two-column style midway in an article, insert

{{Wikipedia:Wikipedia Signpost/Templates/Signpost-block-end-v2}}
{{Wikipedia:Wikipedia Signpost/Templates/Signpost-block-start-v2|fullwidth=no}}

where you want the switch to happen.

To add a series of 'related articles' your article, use the following code

Related articles

Visual Editor

Five, ten, and fifteen years ago
1 January 2023

VisualEditor, endowment, science, and news in brief
5 August 2015

HTTPS-only rollout completed, proposal to enable VisualEditor for new accounts
17 June 2015

VisualEditor and MediaWiki updates
29 April 2015

Security issue fixed; VisualEditor changes
4 February 2015

More articles

Draft namespace, VisualEditor meetings 25 December 2013 Sockpuppet investigations, VisualEditor, Wikidata's birthday, and more 6 November 2013 Last call for Wiki Loves Monuments; Community–WMF tension over VisualEditor 25 September 2013 Making Wikipedia more accessible 4 September 2013 Gallery improvements launch on Wikipedia 28 August 2013 The VisualEditor Beta and the path to change 31 July 2013 Defining consensus; VisualEditor default state; expert and layperson terms in article titles 31 July 2013 VisualEditor in midst of game-changing deployment series 3 July 2013 VisualEditor will "change world history" 12 June 2013 VisualEditor, elections, bots, and more 12 June 2013 The Visual Editor: Where are we now, and where are we headed? 25 March 2013 Visual Editor "on schedule" for July rollout 18 March 2013 Looking ahead to 2013 7 January 2013 The new Visual Editor gets a bit more visual 10 December 2012 Second Visual Editor prototype launches 25 June 2012 Visual editor demo launched, hailed as "most important change to our user experience ... ever"; but elsewhere over-hasty deployments criticised 19 December 2011 Full steam ahead on Visual Editor, the avoidance of lock-breaking and 1.18b1 release 7 November 2011

{{Signpost series
 |type        = sidebar-v2
 |tag         = VisualEditor
 |seriestitle = Visual Editor
 |fullwidth   = no
}}

or

{{Signpost series
 |type        = sidebar-v2
 |tag         = VisualEditor
 |seriestitle = Visual Editor
 |fullwidth   = yes
}}

will create the sidebar on the right. If writing a 'full width' article, change |fullwidth=no to |fullwidth=yes. A partial list of valid |tag= parameters can be found at here and will decide the list of articles presented. |seriestitle= is the title that will appear below 'Related articles' in the box.

Alternatively, you can use

{{Signpost series
 |type        = inline
 |tag         = VisualEditor
 |tag_name    = visual editor
 |tag_pretext = the
}}

at the end of an article to create

For more Signpost coverage on the visual editor see our visual editor series.

If you think a topic would make a good series, but you don't see a tag for it, or that all the articles in a series seem 'old', ask for help at the WT:NEWSROOM. Many more tags exist, but they haven't been documented yet.

By the way, the template that you're reading right now is {{Editnotices/Group/Wikipedia:Wikipedia Signpost/Next issue}} (edit). A list of the preload templates for Signpost articles can be found here.