Your comments
Please tell me which exact toolbar buttons you are missing in what view (AKA which ones you would like to add).
Please use the left-most toolbar button "Local Files" to be able to commit. There is simply no need for a commit dialog in the Standard window.
Please feel free to request it at https://github.com/eclipse-platform/eclipse.platform.swt/issues.
GitLab, see https://smartgit.userecho.com/communities/1/topics/986-gitlab-issue-tracker-support for further requests
Try SmartGit 23.1 preview from https://www.syntevo.com/smartgit/preview/
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The Working Tree and Log windows will stay for all users who are used to them.
The Sync command is not (yet?) available in the Standard window. You are right, Blame and Investigate could be usedful to be added to the toolbar - even for different views because they can operate on local and committed files.
To not dilute this topic, I suggest to discuss non-toolbar button topics better at smartgit@syntevo.com.