While adding helper input_number there's no possibility to choose between 'box' and 'slider' type of this input, which is available via YAML.
UI only shows names and options for slider.

Allow to choose and show options for slider only when slider chosen.
UI -> Helpers -> Add input number
arch | x86_64
-- | --
dev | false
docker | true
hassio | true
os_name | Linux
os_version | 4.19.0-8-amd64
python_version | 3.7.7
timezone | Europe/Warsaw
version | 0.108.3
virtualenv | false
n/a
none
This is supported already and was working in 0.107.7 so it seems this is a fairly recent bug. The line that says "Display mode" is supposed to have radio buttons in front of the "Slider" and "Input field" options, but they are not showing for some reason.
The radio buttons are also missing on other Helpers dialogs too (Text and Date and/or time).
This _may_ sound strange, but try to go to the "Automation" tab, then to "Helpers", and then try to add one.
@ludeeus it is strange, cause it works from this perspective (path)

The workaround doesn't work for the input_boolean
input_boolean's does not have "radio" elements (the circles)
OK but the field for the setting this type of helpers is not displayed. It seems related. Do you think I should open an other issue ?
yes
This _may_ sound strange, but try to go to the "Automation" tab, then to "Helpers", and then try to add one.
Oh wow, That did the trick!
Don't ask question on old closed issues.
You should load those integrations.